Merge pull request #1912 from dotnet-bot/from-tfs

Merge changes from TFS

Author: stephentoub

src/System.Private.DataContractSerialization/src/System/Runtime/Serialization/ClassDataContract.cs

@@ -408,7 +408,8 @@ static internal bool IsNonAttributedTypeValidForSerialization(Type type)
                 "System.Tuple`7",
                 "System.Tuple`8",
                 "System.Collections.Generic.Queue`1",
-                "System.Version"
+                "System.Version",
+                "System.Collections.ObjectModel.ReadOnlyCollection`1"
         };
 
         internal static bool IsKnownSerializableType(Type type)