Cleanup: Presubmit API is built into depot_tools.

tools/metrics/actions/PRESUBMIT.py

 # Copyright 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.
 
 """Presubmit script for actions.xml.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details on the presubmit API built into gcl.
+for more details on the presubmit API built into depot_tools.
 """
 
 
 def CheckChange(input_api, output_api):
   """Checks that actions.xml is up to date and pretty-printed."""
   for f in input_api.AffectedTextFiles():
     p = f.AbsoluteLocalPath()
     if (input_api.basename(p) == 'actions.xml'
         and input_api.os_path.dirname(p) == input_api.PresubmitLocalPath()):
       cwd = input_api.os_path.dirname(p)
       exit_code = input_api.subprocess.call(
           ['python', 'extract_actions.py', '--presubmit'], cwd=cwd)
       if exit_code != 0:
         return [output_api.PresubmitError(
             'actions.xml is not up to date or is not formatted correctly; '
             'run extract_actions.py to fix')]
   return []
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return CheckChange(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return CheckChange(input_api, output_api)