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

third_party/protobuf/csharp/src/Google.Protobuf/MessageParser.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 46 matching lines @@
             return factory();
         }
 
         /// <summary>
         /// Parses a message from a byte array.
         /// </summary>
         /// <param name="data">The byte array containing the message. Must not be null.</param>
         /// <returns>The newly parsed message.</returns>
         public IMessage ParseFrom(byte[] data)
         {
-            Preconditions.CheckNotNull(data, "data");
+            ProtoPreconditions.CheckNotNull(data, "data");
             IMessage message = factory();
             message.MergeFrom(data);
             return message;
         }
 
         /// <summary>
         /// Parses a message from the given byte string.
         /// </summary>
         /// <param name="data">The data to parse.</param>
         /// <returns>The parsed message.</returns>
         public IMessage ParseFrom(ByteString data)
         {
-            Preconditions.CheckNotNull(data, "data");
+            ProtoPreconditions.CheckNotNull(data, "data");
             IMessage message = factory();
             message.MergeFrom(data);
             return message;
         }
 
         /// <summary>
         /// Parses a message from the given stream.
         /// </summary>
         /// <param name="input">The stream to parse.</param>
         /// <returns>The parsed message.</returns>
@@ skipping 93 matching lines @@
             return factory();
         }
 
         /// <summary>
         /// Parses a message from a byte array.
         /// </summary>
         /// <param name="data">The byte array containing the message. Must not be null.</param>
         /// <returns>The newly parsed message.</returns>
         public new T ParseFrom(byte[] data)
         {
-            Preconditions.CheckNotNull(data, "data");
+            ProtoPreconditions.CheckNotNull(data, "data");
             T message = factory();
             message.MergeFrom(data);
             return message;
         }
 
         /// <summary>
         /// Parses a message from the given byte string.
         /// </summary>
         /// <param name="data">The data to parse.</param>
         /// <returns>The parsed message.</returns>
         public new T ParseFrom(ByteString data)
         {
-            Preconditions.CheckNotNull(data, "data");
+            ProtoPreconditions.CheckNotNull(data, "data");
             T message = factory();
             message.MergeFrom(data);
             return message;
         }
 
         /// <summary>
         /// Parses a message from the given stream.
         /// </summary>
         /// <param name="input">The stream to parse.</param>
         /// <returns>The parsed message.</returns>
@@ skipping 40 matching lines @@
         /// <exception cref="InvalidJsonException">The JSON does not comply with RFC 7159</exception>
         /// <exception cref="InvalidProtocolBufferException">The JSON does not represent a Protocol Buffers message correctly</exception>
         public new T ParseJson(string json)
         {
             T message = factory();
             JsonParser.Default.Merge(message, json);
             return message;
         }
     }
 }