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

third_party/protobuf/csharp/src/Google.Protobuf.JsonDump/Program.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 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;
 using System.IO;
-using System.Reflection;
 
 namespace Google.Protobuf.ProtoDump
 {
     /// <summary>
     /// Small utility to load a binary message and dump it in JSON format.
     /// </summary>
     internal class Program
     {
         private static int Main(string[] args)
         {
             if (args.Length != 2)
             {
                 Console.Error.WriteLine("Usage: Google.Protobuf.JsonDump <descriptor type name> <input data>");
                 Console.Error.WriteLine("The descriptor type name is the fully-qualified message name,");
                 Console.Error.WriteLine("including assembly e.g. ProjectNamespace.Message,Company.Project");
                 return 1;
             }
             Type type = Type.GetType(args[0]);
             if (type == null)
             {
                 Console.Error.WriteLine("Unable to load type {0}.", args[0]);
                 return 1;
             }
-            if (!typeof(IMessage).GetTypeInfo().IsAssignableFrom(type))
+            if (!typeof(IMessage).IsAssignableFrom(type))
             {
                 Console.Error.WriteLine("Type {0} doesn't implement IMessage.", args[0]);
                 return 1;
             }
             IMessage message = (IMessage) Activator.CreateInstance(type);
             using (var input = File.OpenRead(args[1]))
             {
                 message.MergeFrom(input);
             }
             Console.WriteLine(message);
             return 0;
         }
     }
 }