update obsolete code.google.com documentation links

tools/clang/translation_unit/test_translation_unit.py

 #!/usr/bin/env python
 # Copyright (c) 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Test for TranslationUnitGenerator tool."""
 
 import difflib
 import glob
 import json
@@ skipping 10 matching lines @@
     return fh.read().replace('$test_files_dir', test_files_dir)
 
 
 def _NumberOfTestsToString(tests):
   """Returns an English sentence describing the number of tests."""
   return "%d test%s" % (tests, 's' if tests != 1 else '')
 
 
 # Before running this test script, please build the translation_unit clang tool
 # first. This is explained here:
-# https://code.google.com/p/chromium/wiki/ClangToolRefactoring
+# https://chromium.googlesource.com/chromium/src/+/master/docs/clang_tool_refactoring.md
 def main():
   tools_clang_directory = os.path.dirname(os.path.dirname(
       os.path.realpath(__file__)))
   tools_clang_scripts_directory = os.path.join(tools_clang_directory, 'scripts')
   test_directory_for_tool = os.path.join(
       tools_clang_directory, 'translation_unit', 'test_files')
   compile_database = os.path.join(test_directory_for_tool,
                                   'compile_commands.json')
   compile_database_template = compile_database + '.template'
   source_files = glob.glob(os.path.join(test_directory_for_tool, '*.cc'))
@@ skipping 54 matching lines @@
 
   print '[==========] %s ran.' % _NumberOfTestsToString(len(source_files))
   if passed > 0:
     print '[  PASSED  ] %s.' % _NumberOfTestsToString(passed)
   if failed > 0:
     print '[  FAILED  ] %s.' % _NumberOfTestsToString(failed)
 
 
 if __name__ == '__main__':
   sys.exit(main())