Fix the copyright header on the policy protobufs.

chrome/browser/policy/proto/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.
 
 # TODO(joaodasilva): remove this file. http://crbug.com/327345
 
 import itertools
 
 def _CheckPolicyProtobufs(input_api, output_api):
   # List of pairs (A, B) where A should equal B.
@@ skipping 14 matching lines @@
       'components/policy/proto/PRESUBMIT.py' ),
   ]
 
   root = input_api.change.RepositoryRoot()
   results = []
 
   for file_a, file_b in file_pairs:
     path_a = input_api.os_path.join(root, *file_a.split('/'))
     path_b = input_api.os_path.join(root, *file_b.split('/'))
     with open(path_a, 'r') as f_a:
-      content_a = f_a.read()
+      content_a = f_a.readlines()[3:]
     with open(path_b, 'r') as f_b:
-      content_b = f_b.read()
+      content_b = f_b.readlines()[3:]
     if content_a != content_b:
       # If you get this error then check |file_pairs| and make sure that the
       # contents of the files in each pair match.
       results.append(output_api.PresubmitError(
           '%s must equal %s. This is temporary until http://crbug.com/327345 '
           'is fixed.' % (file_a, file_b)))
 
   # If new files are added then |file_pairs| must be updated.
   existing = frozenset(itertools.chain(*file_pairs))
   for f in input_api.AffectedFiles():
@@ skipping 10 matching lines @@
 def _CommonChecks(input_api, output_api):
   return _CheckPolicyProtobufs(input_api, output_api)
 
 
 def CheckChangeOnUpload(input_api, output_api):
   return _CommonChecks(input_api, output_api)
 
 
 def CheckChangeOnCommit(input_api, output_api):
   return _CommonChecks(input_api, output_api)