Fix Python error in build-webapp.py:parseBool()

remoting/webapp/build-webapp.py

 #!/usr/bin/env python
 # 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.
 
 """Creates a directory with with the unpacked contents of the remoting webapp.
 
 The directory will contain a copy-of or a link-to to all remoting webapp
 resources.  This includes HTML/JS and any plugin binaries. The script also
 massages resulting files appropriately with host plugin data. Finally,
@@ skipping 58 matching lines @@
   # would satisfy the compiler but might confused human readers.
   findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                  "!!'" + placeholder + "'", 'true' if value else 'false')
 
 
 def parseBool(boolStr):
   """Tries to parse a string as a boolean value.
 
   Returns a bool on success; raises ValueError on failure.
   """
-  lower = boolStr.tolower()
+  lower = boolStr.lower()
   if lower in ['0', 'false']: return False
   if lower in ['1', 'true']: return True
   raise ValueError('not a boolean string {!r}'.format(boolStr))
 
 
 def getenvBool(name, defaultValue):
   """Gets an environment value as a boolean."""
   rawValue = os.environ.get(name)
   if rawValue is None:
     return defaultValue
@@ skipping 368 matching lines @@
   parser.add_argument('--use_gcd', choices=['0', '1'], default='0')
 
   args = parser.parse_args()
   args.use_gcd = (args.use_gcd != '0')
   args.app_capabilities = set(args.app_capabilities)
   return buildWebApp(**vars(args))
 
 
 if __name__ == '__main__':
   sys.exit(main())