Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs

 #region Copyright notice and license
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 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 231 matching lines @@
         }
         
         [Test]
         [TestCase("[10, 20", 3)]
         [TestCase("[10,", 2)]
         [TestCase("[10:20]", 2)]
         [TestCase("[", 1)]
         [TestCase("[,", 1)]
         [TestCase("{", 1)]
         [TestCase("{,", 1)]
-        [TestCase("{", 1)]
         [TestCase("{[", 1)]
         [TestCase("{{", 1)]
         [TestCase("{0", 1)]
         [TestCase("{null", 1)]
         [TestCase("{false", 1)]
         [TestCase("{true", 1)]
         [TestCase("}", 0)]
         [TestCase("]", 0)]
         [TestCase(",", 0)]
         [TestCase("'foo' 'bar'", 1)]
@@ skipping 137 matching lines @@
                 if (actualToken == JsonToken.EndDocument)
                 {
                     Assert.Fail("Expected {0} but reached end of document", expectedTokens[i]);
                 }
                 Assert.AreEqual(expectedTokens[i], actualToken);
             }
             Assert.Throws<InvalidJsonException>(() => tokenizer.Next());
         }
     }
 }