Transition `HashCodeCombiner` to use the `aspnet/Common` variation.

- Updated `LocationTagged<TValue>` to handle `null` implicit values.
- Removed `InternalsVisibleTo` declaration on `Microsoft.AspNet.Razor` to the runtime test project.
- Updated `TagHelperDescriptor` tests to utilize helper methods to construct `TagHelperDescriptor`s. This was needed since the `InternalsVisibleTo` declaration was removed.

#449

src/Microsoft.AspNet.Razor.Test.Sources/CaseSensitiveTagHelperDescriptorComparer.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Linq;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Test.Internal
 {

src/Microsoft.AspNet.Razor.Test.Sources/TagHelperAttributeDescriptorComparer.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Test.Internal
 {

src/Microsoft.AspNet.Razor.Test.Sources/TagHelperAttributeDesignTimeDescriptorComparer.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Test.Internal
 {

src/Microsoft.AspNet.Razor.Test.Sources/TagHelperDesignTimeDescriptorComparer.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Test.Internal
 {

src/Microsoft.AspNet.Razor/Chunks/Generators/AttributeBlockChunkGenerator.cs

@@ -5,7 +5,7 @@ using System;
 using System.Globalization;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.AspNet.Razor.Text;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Chunks.Generators
 {

src/Microsoft.AspNet.Razor/Chunks/Generators/LiteralAttributeChunkGenerator.cs

@@ -4,7 +4,7 @@
 using System.Globalization;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.AspNet.Razor.Text;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Chunks.Generators
 {

src/Microsoft.AspNet.Razor/CodeGenerators/GeneratedClassContext.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor.CodeGenerators
 {

src/Microsoft.AspNet.Razor/CodeGenerators/LineMapping.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Globalization;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.CodeGenerators
 {

src/Microsoft.AspNet.Razor/CodeGenerators/MappingLocation.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Globalization;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.CodeGenerators
 {

src/Microsoft.AspNet.Razor/Common/HashCodeCombiner.cs

@@ -1,61 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System.Collections;
-using System.Collections.Generic;
-
-namespace Microsoft.Internal.Web.Utils
-{
-    public class HashCodeCombiner
-    {
-        private long _combinedHash64 = 0x1505L;
-
-        public int CombinedHash
-        {
-            get { return _combinedHash64.GetHashCode(); }
-        }
-
-        public HashCodeCombiner Add(IEnumerable e)
-        {
-            if (e == null)
-            {
-                Add(0);
-            }
-            else
-            {
-                var count = 0;
-                foreach (object o in e)
-                {
-                    Add(o);
-                    count++;
-                }
-                Add(count);
-            }
-            return this;
-        }
-
-        public HashCodeCombiner Add(int i)
-        {
-            _combinedHash64 = ((_combinedHash64 << 5) + _combinedHash64) ^ i;
-            return this;
-        }
-
-        public HashCodeCombiner Add(object o)
-        {
-            var hashCode = (o != null) ? o.GetHashCode() : 0;
-            Add(hashCode);
-            return this;
-        }
-
-        public HashCodeCombiner Add<TValue>(TValue value, IEqualityComparer<TValue> comparer)
-        {
-            var hashCode = value != null ? comparer.GetHashCode(value) : 0;
-            return Add(hashCode);
-        }
-
-        public static HashCodeCombiner Start()
-        {
-            return new HashCodeCombiner();
-        }
-    }
-}

src/Microsoft.AspNet.Razor/Editor/AutoCompleteEditHandler.cs

@@ -7,7 +7,7 @@ using System.Diagnostics.CodeAnalysis;
 using Microsoft.AspNet.Razor.Editor;
 using Microsoft.AspNet.Razor.Text;
 using Microsoft.AspNet.Razor.Tokenizer.Symbols;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Parser.SyntaxTree
 {

src/Microsoft.AspNet.Razor/Editor/ImplicitExpressionEditHandler.cs

@@ -12,7 +12,7 @@ using Microsoft.AspNet.Razor.Parser;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.AspNet.Razor.Text;
 using Microsoft.AspNet.Razor.Tokenizer.Symbols;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Editor
 {

src/Microsoft.AspNet.Razor/Parser/SyntaxTree/Block.cs

@@ -8,7 +8,7 @@ using System.Globalization;
 using System.Linq;
 using Microsoft.AspNet.Razor.Chunks.Generators;
 using Microsoft.AspNet.Razor.Text;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Parser.SyntaxTree
 {

src/Microsoft.AspNet.Razor/Parser/TagHelpers/TagHelperBlock.cs

@@ -7,7 +7,7 @@ using System.Globalization;
 using System.Linq;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.AspNet.Razor.TagHelpers;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Parser.TagHelpers
 {

src/Microsoft.AspNet.Razor/RazorError.cs

@@ -3,7 +3,7 @@
 
 using System;
 using System.Globalization;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor
 {

src/Microsoft.AspNet.Razor/SourceLocation.cs

@@ -5,7 +5,6 @@ using System;
 using System.Globalization;
 using Microsoft.AspNet.Razor.Text;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor
 {

src/Microsoft.AspNet.Razor/TagHelpers/TagHelperDescriptorComparer.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor.TagHelpers
 {

src/Microsoft.AspNet.Razor/TagHelpers/TypeBasedTagHelperDescriptorComparer.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections.Generic;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor.TagHelpers
 {

src/Microsoft.AspNet.Razor/Text/LocationTagged.cs

@@ -5,7 +5,6 @@ using System;
 using System.Diagnostics;
 using System.Globalization;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor.Text
 {
@@ -79,7 +78,7 @@ namespace Microsoft.AspNet.Razor.Text
 
         public static implicit operator TValue(LocationTagged<TValue> value)
         {
-            return value.Value;
+            return value == null ? default(TValue) : value.Value;
         }
 
         public static bool operator ==(LocationTagged<TValue> left, LocationTagged<TValue> right)

src/Microsoft.AspNet.Razor/Text/TextChange.cs

@@ -7,7 +7,6 @@ using System.Globalization;
 using System.Text;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor.Text
 {

src/Microsoft.AspNet.Razor/Tokenizer/Symbols/SymbolBase.cs

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using Microsoft.Framework.Internal;
-using Microsoft.Internal.Web.Utils;
 
 namespace Microsoft.AspNet.Razor.Tokenizer.Symbols
 {

src/Microsoft.AspNet.Razor/project.json

@@ -6,6 +6,10 @@
     "url": "git://github.com/aspnet/razor"
   },
   "dependencies": {
+    "Microsoft.Framework.HashCodeCombiner.Sources": {
+      "type": "build",
+      "version": "1.0.0-*"
+    },
     "Microsoft.Framework.NotNullAttribute.Sources": {
       "type": "build",
       "version": "1.0.0-*"

test/Microsoft.AspNet.Razor.Test/CodeGenerators/TestSpan.cs

@@ -2,7 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.Razor.Test.Generator
 {

test/Microsoft.AspNet.Razor.Test/TagHelpers/TagHelperDirectiveSpanVisitorTest.cs

@@ -8,7 +8,7 @@ using Microsoft.AspNet.Razor.Parser;
 using Microsoft.AspNet.Razor.Parser.SyntaxTree;
 using Microsoft.AspNet.Razor.Parser.TagHelpers;
 using Microsoft.AspNet.Razor.Test.Framework;
-using Microsoft.Internal.Web.Utils;
+using Microsoft.Framework.Internal;
 #if !DNXCORE50
 using Moq;
 #endif