Fix ARB regexp

scripts/tools/blink_roller/auto_roll_test.py

 #!/usr/bin/env python
 # 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.
 
 
 import datetime
 import unittest
 
 import auto_roll
@@ skipping 388 matching lines @@
 
 
 class AutoRollTestGit(AutoRollTestBase):
 
   OLDER_REV = 'cfcf604fbdcf6e2d9b982a2fab3fc9f1e3f8cd65'
   OLD_REV =   'b9af6489f6f2004ad11b82c6057f7007e3c35372'
   NEW_REV =   '79539998e04afab3ee9c3016881755ca52f60a73'
 
   DEPS_CONTENT = '''
 vars = {
-  'test_project_revision': '%s',
+  'test_project_revision': '%s', # Some comment.
 }
 ''' % OLD_REV
 
   _GIT_LOG = '''
 commit %s
 Author: Test Author <test_author@example.com>
 Date:   Wed Apr 2 14:00:14 2014 -0400
 
     Make some changes.
 '''
@@ skipping 41 matching lines @@
 
   # pylint: disable=R0201
   def _parse_origin_master(self, returnval):
     auto_roll.subprocess2.check_output(
         ['git', '--git-dir', './third_party/test_project/.git', 'rev-parse',
          'origin/master']).AndReturn(returnval)
 
 
 if __name__ == '__main__':
   unittest.main()