third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs

 #region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
 // Copyright 2015 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
@@ skipping 78 matching lines @@
             var unpacked = any.Unpack<TestAllTypes>();
             Assert.AreEqual(message, unpacked);
         }
 
         [Test]
         public void ToString_WithValues()
         {
             var message = SampleMessages.CreateFullTestAllTypes();
             var any = Any.Pack(message);
             var text = any.ToString();
-            Assert.That(text, Is.StringContaining("\"@value\": \"" + message.ToByteString().ToBase64() + "\""));
+            Assert.That(text, Does.Contain("\"@value\": \"" + message.ToByteString().ToBase64() + "\""));
         }
 
         [Test]
         public void ToString_Empty()
         {
             var any = new Any();
             Assert.AreEqual("{ \"@type\": \"\", \"@value\": \"\" }", any.ToString());
         }
 
         [Test]
         public void ToString_MessageContainingAny()
         {
             var message = new TestWellKnownTypes { AnyField = new Any() };
             Assert.AreEqual("{ \"anyField\": { \"@type\": \"\", \"@value\": \"\" } }", message.ToString());
         }
     }
 }