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

third_party/protobuf/csharp/src/Google.Protobuf/MessageExtensions.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 28 matching lines @@
     /// </summary>
     public static class MessageExtensions
     {
         /// <summary>
         /// Merges data from the given byte array into an existing message.
         /// </summary>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="data">The data to merge, which must be protobuf-encoded binary data.</param>
         public static void MergeFrom(this IMessage message, byte[] data)
         {
-            Preconditions.CheckNotNull(message, "message");
-            Preconditions.CheckNotNull(data, "data");
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(data, "data");
             CodedInputStream input = new CodedInputStream(data);
             message.MergeFrom(input);
             input.CheckReadEndOfStreamTag();
         }
 
         /// <summary>
         /// Merges data from the given byte string into an existing message.
         /// </summary>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="data">The data to merge, which must be protobuf-encoded binary data.</param>
         public static void MergeFrom(this IMessage message, ByteString data)
         {
-            Preconditions.CheckNotNull(message, "message");
-            Preconditions.CheckNotNull(data, "data");
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(data, "data");
             CodedInputStream input = data.CreateCodedInput();
             message.MergeFrom(input);
             input.CheckReadEndOfStreamTag();
         }
 
         /// <summary>
         /// Merges data from the given stream into an existing message.
         /// </summary>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="input">Stream containing the data to merge, which must be protobuf-encoded binary data.</param>
         public static void MergeFrom(this IMessage message, Stream input)
         {
-            Preconditions.CheckNotNull(message, "message");
-            Preconditions.CheckNotNull(input, "input");
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(input, "input");
             CodedInputStream codedInput = new CodedInputStream(input);
             message.MergeFrom(codedInput);
             codedInput.CheckReadEndOfStreamTag();
         }
 
         /// <summary>
         /// Merges length-delimited data from the given stream into an existing message.
         /// </summary>
         /// <remarks>
         /// The stream is expected to contain a length and then the data. Only the amount of data
         /// specified by the length will be consumed.
         /// </remarks>
         /// <param name="message">The message to merge the data into.</param>
         /// <param name="input">Stream containing the data to merge, which must be protobuf-encoded binary data.</param>
         public static void MergeDelimitedFrom(this IMessage message, Stream input)
         {
-            Preconditions.CheckNotNull(message, "message");
-            Preconditions.CheckNotNull(input, "input");
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(input, "input");
             int size = (int) CodedInputStream.ReadRawVarint32(input);
             Stream limitedStream = new LimitedInputStream(input, size);
             message.MergeFrom(limitedStream);
         }
 
         /// <summary>
         /// Converts the given message into a byte array in protobuf encoding.
         /// </summary>
         /// <param name="message">The message to convert.</param>
         /// <returns>The message data as a byte array.</returns>
         public static byte[] ToByteArray(this IMessage message)
         {
-            Preconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(message, "message");
             byte[] result = new byte[message.CalculateSize()];
             CodedOutputStream output = new CodedOutputStream(result);
             message.WriteTo(output);
             output.CheckNoSpaceLeft();
             return result;
         }
 
         /// <summary>
         /// Writes the given message data to the given stream in protobuf encoding.
         /// </summary>
         /// <param name="message">The message to write to the stream.</param>
         /// <param name="output">The stream to write to.</param>
         public static void WriteTo(this IMessage message, Stream output)
         {
-            Preconditions.CheckNotNull(message, "message");
-            Preconditions.CheckNotNull(output, "output");
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(output, "output");
             CodedOutputStream codedOutput = new CodedOutputStream(output);
             message.WriteTo(codedOutput);
             codedOutput.Flush();
         }
 
         /// <summary>
         /// Writes the length and then data of the given message to a stream.
         /// </summary>
         /// <param name="message">The message to write.</param>
         /// <param name="output">The output stream to write to.</param>
         public static void WriteDelimitedTo(this IMessage message, Stream output)
         {
-            Preconditions.CheckNotNull(message, "message");
-            Preconditions.CheckNotNull(output, "output");
+            ProtoPreconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(output, "output");
             CodedOutputStream codedOutput = new CodedOutputStream(output);
             codedOutput.WriteRawVarint32((uint)message.CalculateSize());
             message.WriteTo(codedOutput);
             codedOutput.Flush();
         }
 
         /// <summary>
         /// Converts the given message into a byte string in protobuf encoding.
         /// </summary>
         /// <param name="message">The message to convert.</param>
         /// <returns>The message data as a byte string.</returns>
         public static ByteString ToByteString(this IMessage message)
         {
-            Preconditions.CheckNotNull(message, "message");
+            ProtoPreconditions.CheckNotNull(message, "message");
             return ByteString.AttachBytes(message.ToByteArray());
         }        
     }
 }