Imported Upstream version 5.0.0.48

Former-commit-id: 820b1abb8b0084602f3170cd587a99c905e1dae5

external/binary-reference-assemblies/src/v4.5.2/System.IdentityModel.extra.cs

@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.ServiceModel.Security
+{
+    internal partial class EncryptedKey { }
+    internal partial class EncryptedKeyHashIdentifierClause { }
+    internal partial class EncryptedType { }
+    internal partial interface ISspiNegotiation { }
+    internal partial interface ISspiNegotiationInfo { }
+    internal partial class ReferenceList { }
+    internal partial class RelAssertionDirectKeyIdentifierClause { }
+    internal partial class SamlAssertionDirectKeyIdentifierClause { }
+}
+namespace System.ServiceModel.Security.Tokens
+{
+    internal partial class BufferedGenericXmlSecurityToken { }
+}