Links in the source code to code.google.com should be replaced.

[xfxyjwf]

For example:

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/

http://code.google.com/p/protobuf/ should be replaced with either https://developers.google.com/protocol-buffers/ or https://github.com/google/protobuf.