Cleanup: Presubmit API is built into depot_tools.

tools/binary_size/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.
 
 """binary_size presubmit script
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details about the presubmit API built into gcl.
+for more details about the presubmit API built into depot_tools.
 """
 
 def CommonChecks(input_api, output_api):
   output = []
   output.extend(input_api.canned_checks.RunPylint(input_api, output_api))
   output.extend(
       input_api.canned_checks.RunUnitTestsInDirectory(
           input_api, output_api,
           input_api.PresubmitLocalPath(),
           whitelist=[r'.+_unittest\.py$']))
 
   if input_api.is_committing:
     output.extend(input_api.canned_checks.PanProjectChecks(input_api,
                                                            output_api,
                                                            owners_check=False))
   return output
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return CommonChecks(input_api, output_api)