Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/csharp/src/Google.Protobuf.Test/FieldCodecTest.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 14 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
 using System.Collections.Generic;
 using System.IO;
-using System.Reflection;
 using Google.Protobuf.TestProtos;
 using NUnit.Framework;
 
 namespace Google.Protobuf
 {
     public class FieldCodecTest
     {
 #pragma warning disable 0414 // Used by tests via reflection - do not remove!
         private static readonly List<ICodecTestData> Codecs = new List<ICodecTestData>
         {
@@ skipping 110 matching lines @@
 
             public void TestDefaultValue()
             {
                 // WriteTagAndValue ignores default values
                 var stream = new MemoryStream();
                 var codedOutput = new CodedOutputStream(stream);
                 codec.WriteTagAndValue(codedOutput, codec.DefaultValue);
                 codedOutput.Flush();
                 Assert.AreEqual(0, stream.Position);
                 Assert.AreEqual(0, codec.CalculateSizeWithTag(codec.DefaultValue));
-                if (typeof(T).GetTypeInfo().IsValueType)
+                if (typeof(T).IsValueType)
                 {
                     Assert.AreEqual(default(T), codec.DefaultValue);
                 }
 
                 // The plain ValueWriter/ValueReader delegates don't.
                 if (codec.DefaultValue != null) // This part isn't appropriate for message types.
                 {
                     codedOutput = new CodedOutputStream(stream);
                     codec.ValueWriter(codedOutput, codec.DefaultValue);
                     codedOutput.Flush();
@@ skipping 10 matching lines @@
                 Assert.AreEqual(name.Contains("Fixed"), codec.FixedSize != 0);
             }
 
             public override string ToString()
             {
                 return name;
             }
         }
     }
 }