Revert "Temporarily remove compiling against non roslyn project references"

This reverts commit 088bcac028.

src/Microsoft.AspNet.Mvc.Razor/Compilation/RoslynCompilationService.cs

@@ -233,8 +233,6 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
                 return CreateMetadataFileReference(fileMetadataReference.Path);
             }
 
-            /*
-            TODO: Bring this back once we fix https://github.com/aspnet/dnx/issues/922
             var projectReference = metadataReference as IMetadataProjectReference;
             if (projectReference != null)
             {
@@ -245,7 +243,6 @@ namespace Microsoft.AspNet.Mvc.Razor.Compilation
                     return MetadataReference.CreateFromImage(ms.ToArray());
                 }
             }
-            */
 
             throw new NotSupportedException();
         }