[Android] Fix new pylint errors in build/android/.

build/android/avd.py

 #!/usr/bin/env python
 # Copyright (c) 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.
 
 """Launches Android Virtual Devices with a set configuration for testing Chrome.
 
 The script will launch a specified number of Android Virtual Devices (AVD's).
 """
 
@@ skipping 52 matching lines @@
                      'install_emulator_deps.py.')
     return 1
 
   # If AVD is specified, check that the SDK has the required target. If not,
   # check that the SDK has the desired target for the temporary AVD's.
   api_level = options.api_level
   if options.name:
     android = os.path.join(constants.EMULATOR_SDK_ROOT, 'sdk', 'tools',
                            'android')
     avds_output = cmd_helper.GetCmdOutput([android, 'list', 'avd'])
-    names = re.findall('Name: (\w+)', avds_output)
-    api_levels = re.findall('API level (\d+)', avds_output)
+    names = re.findall(r'Name: (\w+)', avds_output)
+    api_levels = re.findall(r'API level (\d+)', avds_output)
     try:
       avd_index = names.index(options.name)
     except ValueError:
       logging.critical('ERROR: Specified AVD %s does not exist.' % options.name)
       return 1
     api_level = int(api_levels[avd_index])
 
   if not install_emulator_deps.CheckSDKPlatform(api_level):
     logging.critical('ERROR: Emulator SDK missing required target for API %d. '
                      'Run install_emulator_deps.py.')
     return 1
 
   if options.name:
     emulator.LaunchEmulator(options.name, options.abi)
   else:
     emulator.LaunchTempEmulators(options.emulator_count, options.abi,
                                  options.api_level, True)
 
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))