Fix UserAction presubmit incorrectly not matching existing actions.

PRESUBMIT.py

 # Copyright (c) 2012 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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 1012 matching lines @@
   with open('tools/metrics/actions/chromeactions.txt') as f:
     current_actions = f.read()
 
   file_filter = lambda f: f.LocalPath().endswith(('.cc', '.mm'))
   action_re = r'[^a-zA-Z]UserMetricsAction\("([^"]*)'
   for f in input_api.AffectedFiles(file_filter=file_filter):
     for line_num, line in f.ChangedContents():
       match = input_api.re.search(action_re, line)
       if match:
         for action_name in match.groups():
-          name_pattern = r'\t%s\n' % action_name
+          name_pattern = '\t%s\n' % action_name
           if name_pattern not in current_actions:
             return [output_api.PresubmitPromptWarning(
               'File %s line %d: %s is missing in '
               'tools/metrics/actions/chromeactions.txt. Please run '
               'tools/metrics/actions/extract_actions.py --hash to update.'
               % (f.LocalPath(), line_num, action_name))]
   return []
 
 
 def _CheckJavaStyle(input_api, output_api):
@@ skipping 407 matching lines @@
     trybots.extend(GetDefaultTryConfigs(['cros_x86']))
 
   # The AOSP bot doesn't build the chrome/ layer, so ignore any changes to it
   # unless they're .gyp(i) files as changes to those files can break the gyp
   # step on that bot.
   if (not all(re.search('^chrome', f) for f in files) or
       any(re.search('\.gypi?$', f) for f in files)):
     trybots.extend(GetDefaultTryConfigs(['android_aosp']))
 
   return trybots