Cleanup: Presubmit API is built into depot_tools.

tools/lsan/PRESUBMIT.py

 # Copyright 2013 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.
 
 """
 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.
 """
 
 import re
 
 def CheckChange(input_api, output_api):
   errors = []
 
   for f in input_api.AffectedFiles():
     if not f.LocalPath().endswith('suppressions.txt'):
       continue
     for line_num, line in enumerate(f.NewContents()):
       line = line.strip()
       if line.startswith('#') or not line:
         continue
       if not line.startswith('leak:'):
         errors.append('"%s" should be "leak:..." in %s line %d' %
                       (line, f.LocalPath(), line_num))
   if errors:
     return [output_api.PresubmitError('\n'.join(errors))]
   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)