Cleanup warnings

- primary action is removing interfaces from Razor that Core exports
- also remove an unused field from Core's `DefaultControllerAssemblyProvider`

src/Microsoft.AspNet.Mvc.Core/DefaultControllerAssemblyProvider.cs

@@ -19,7 +19,6 @@ namespace Microsoft.AspNet.Mvc
             "Microsoft.AspNet.Mvc.Rendering",
         };
         private readonly ILibraryManager _libraryManager;
-        private readonly Func<ILibraryInformation, Assembly> _assemblyLoader;
 
         public DefaultControllerAssemblyProvider(ILibraryManager libraryManager)
         {

src/Microsoft.AspNet.Mvc.Razor/Services/IApplicationEnvironment.cs

@@ -11,7 +11,4 @@ namespace Microsoft.Net.Runtime
         string ApplicationBasePath { get; }
         FrameworkName TargetFramework { get; }
     }
-
-    [AssemblyNeutral]
-    public class AssemblyNeutralAttribute : Attribute { }
 }

src/Microsoft.AspNet.Mvc.Razor/Services/ILibraryExport.cs

@@ -1,12 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace Microsoft.Net.Runtime
-{
-    [AssemblyNeutral]
-    public interface ILibraryExport
-    {
-        IList<IMetadataReference> MetadataReferences { get; }
-        IList<ISourceReference> SourceReferences { get; }
-    }
-}

src/Microsoft.AspNet.Mvc.Razor/Services/ILibraryInformation.cs

@@ -1,12 +0,0 @@
-using System.Collections.Generic;
-
-namespace Microsoft.Net.Runtime
-{
-    [AssemblyNeutral]
-    public interface ILibraryInformation
-    {
-        string Name { get; }
-
-        IEnumerable<string> Dependencies { get; }
-    }
-}

src/Microsoft.AspNet.Mvc.Razor/Services/ILibraryManager.cs

@@ -1,16 +0,0 @@
-using System.Collections.Generic;
-
-namespace Microsoft.Net.Runtime
-{
-    [AssemblyNeutral]
-    public interface ILibraryManager
-    {
-        ILibraryExport GetLibraryExport(string name);
-
-        IEnumerable<ILibraryInformation> GetReferencingLibraries(string name);
-
-        ILibraryInformation GetLibraryInformation(string name);
-
-        IEnumerable<ILibraryInformation> GetLibraries();
-    }
-}

src/Microsoft.AspNet.Mvc.Razor/Services/IMetadataReference.cs

@@ -1,9 +0,0 @@
-
-namespace Microsoft.Net.Runtime
-{
-    [AssemblyNeutral]
-    public interface IMetadataReference
-    {
-        string Name { get; }
-    }
-}

src/Microsoft.AspNet.Mvc.Razor/Services/ISourceReference.cs

@@ -1,7 +0,0 @@
-namespace Microsoft.Net.Runtime
-{
-    [AssemblyNeutral]
-    public interface ISourceReference
-    {
-    }
-}