third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/csharp/src/AddressBook/SampleUsage.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 48 matching lines @@
             AddressBook book = new AddressBook
             {
                 People = { copy }
             };
             bytes = book.ToByteArray();
             // And read the address book back again
             AddressBook restored = AddressBook.Parser.ParseFrom(bytes);
             // The message performs a deep-comparison on equality:
             if (restored.People.Count != 1 || !person.Equals(restored.People[0]))
             {
-                throw new ApplicationException("There is a bad person in here!");
+                throw new Exception("There is a bad person in here!");
             }
         }
     }
 }