Removes python_test_root flag name entirely

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # 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.
 
 """Runs all types of tests from one unified interface.
 
 TODO(gkanwar):
 * Add options to run Monkey tests.
@@ skipping 199 matching lines @@
                            '--test-apk=ChromiumTestShellTest')
 
   AddJavaTestOptions(option_parser)
   AddCommonOptions(option_parser)
 
   option_parser.add_option('-j', '--java_only', action='store_true',
                            default=False, help='Run only the Java tests.')
   option_parser.add_option('-p', '--python_only', action='store_true',
                            default=False,
                            help='Run only the host-driven tests.')
-  option_parser.add_option('--python_test_root', '--host-driven-root',
-                           dest='host_driven_root',
+  option_parser.add_option('--host-driven-root',
                            help='Root of the host-driven tests.')
   option_parser.add_option('-w', '--wait_debugger', dest='wait_for_debugger',
                            action='store_true',
                            help='Wait for debugger.')
   option_parser.add_option(
       '--test-apk', dest='test_apk',
       help=('The name of the apk containing the tests '
             '(without the .apk extension; e.g. "ContentShellTest"). '
             'Alternatively, this can be a full path to the apk.'))
 
@@ skipping 518 matching lines @@
     option_parser.error('Invalid command.')
   command = argv[1]
   VALID_COMMANDS[command].add_options_func(option_parser)
   options, args = option_parser.parse_args(argv)
   return VALID_COMMANDS[command].run_command_func(
       command, options, args, option_parser)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))