Remove unneeded namespaces.

aspnet/Razor#578

src/Microsoft.AspNet.Mvc.Razor/Precompilation/RazorPreCompiler.cs

@@ -14,7 +14,6 @@ using Microsoft.AspNet.Mvc.Razor.Directives;
 using Microsoft.AspNet.Mvc.Razor.Internal;
 using Microsoft.AspNet.Razor.Runtime.Precompilation;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
-using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.Dnx.Compilation;

src/Microsoft.AspNet.Mvc.Razor/TagHelperContentWrapperTextWriter.cs

@@ -4,7 +4,6 @@
 using System;
 using System.IO;
 using System.Text;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 
 namespace Microsoft.AspNet.Mvc.Razor

src/Microsoft.AspNet.Mvc.TagHelpers/LinkTagHelper.cs

@@ -10,7 +10,6 @@ using Microsoft.AspNet.Mvc.Razor.TagHelpers;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TagHelpers.Internal;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;

src/Microsoft.AspNet.Mvc.TagHelpers/ScriptTagHelper.cs

@@ -9,7 +9,6 @@ using Microsoft.AspNet.Mvc.Razor.TagHelpers;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TagHelpers.Internal;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/AnchorTagHelperTest.cs

@@ -9,7 +9,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.Routing;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Moq;
 using Xunit;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/CacheTagHelperTest.cs

@@ -16,7 +16,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Microsoft.Extensions.Caching.Memory;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/EnvironmentTagHelperTest.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Hosting;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Moq;
 using Xunit;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/FormTagHelperTest.cs

@@ -14,7 +14,6 @@ using Microsoft.AspNet.Mvc.Routing;
 using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Microsoft.Extensions.WebEncoders.Testing;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/ImageTagHelperTest.cs

@@ -15,7 +15,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Microsoft.Extensions.Caching.Memory;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/InputTagHelperTest.cs

@@ -12,7 +12,6 @@ using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Mvc.ViewFeatures.Internal;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Moq;
 using Xunit;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/Internal/AttributeMatcherTest.cs

@@ -3,8 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Threading.Tasks;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Xunit;
 

test/Microsoft.AspNet.Mvc.TagHelpers.Test/LabelTagHelperTest.cs

@@ -9,7 +9,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Xunit;
 

test/Microsoft.AspNet.Mvc.TagHelpers.Test/LinkTagHelperTest.cs

@@ -16,7 +16,6 @@ using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TagHelpers.Internal;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Microsoft.Dnx.Runtime;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/OptionTagHelperTest.cs

@@ -5,7 +5,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.ModelBinding;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Xunit;
 

test/Microsoft.AspNet.Mvc.TagHelpers.Test/RenderAtEndOfFormTagHelperTest.cs

@@ -5,7 +5,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Mvc.ViewFeatures;
 using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Xunit;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/ScriptTagHelperTest.cs

@@ -16,7 +16,6 @@ using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TagHelpers.Internal;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Microsoft.Dnx.Runtime;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/SelectTagHelperTest.cs

@@ -10,7 +10,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Moq;
 using Xunit;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/TagHelperOutputExtensionsTest.cs

@@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc.Rendering;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Testing;
 using Xunit;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/TextAreaTagHelperTest.cs

@@ -9,7 +9,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.TestCommon;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Xunit;
 

test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationMessageTagHelperTest.cs

@@ -12,7 +12,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Moq;

test/Microsoft.AspNet.Mvc.TagHelpers.Test/ValidationSummaryTagHelperTest.cs

@@ -13,7 +13,6 @@ using Microsoft.AspNet.Mvc.ModelBinding;
 using Microsoft.AspNet.Mvc.Rendering;
 using Microsoft.AspNet.Mvc.ViewEngines;
 using Microsoft.AspNet.Mvc.ViewFeatures;
-using Microsoft.AspNet.Razor.Runtime.TagHelpers;
 using Microsoft.AspNet.Razor.TagHelpers;
 using Microsoft.AspNet.Routing;
 using Microsoft.AspNet.Testing;