[chrome_remote_control] Use monkey patching for stubs.

tools/chrome_remote_control/chrome_remote_control/cros_browser_finder.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.
 """Finds android browsers that can be controlled by chrome_remote_control."""
 
 import logging
 
 from chrome_remote_control import browser
 from chrome_remote_control import possible_browser
 from chrome_remote_control import cros_browser_backend
-from chrome_remote_control import (
-  cros_interface as real_cros_interface)
+from chrome_remote_control import cros_interface
 
 ALL_BROWSER_TYPES = ','.join([
     'cros-chrome',
     ])
 
 class PossibleCrOSBrowser(possible_browser.PossibleBrowser):
   """A launchable android browser instance."""
   def __init__(self, browser_type, options, *args):
     super(PossibleCrOSBrowser, self).__init__(
         browser_type, options)
     self._args = args
 
   def __repr__(self):
     return 'PossibleCrOSBrowser(browser_type=%s)' % self.browser_type
 
   def Create(self):
     backend = cros_browser_backend.CrOSBrowserBackend(
         self.browser_type, self._options, *self._args)
     return browser.Browser(backend)
 
-def FindAllAvailableBrowsers(options,
-                             cros_interface = real_cros_interface):
+def FindAllAvailableBrowsers(options):
   """Finds all the desktop browsers available on this machine."""
   if options.cros_remote == None:
     logging.debug('No --remote specified, will not probe for CrOS.')
     return []
 
   if not cros_interface.HasSSH():
     logging.debug('ssh not found. Cannot talk to CrOS devices.')
     return []
   cri = cros_interface.CrOSInterface(options.cros_remote,
                                      options.cros_ssh_identity)
@@ skipping 23 matching lines @@
       logging.warn('')
       logging.warn('P.S. Please, make tell your manager how INANE this.')
     else:
       logging.warn(str(ex))
     return []
 
   if not cri.FileExistsOnDevice('/opt/google/chrome/chrome'):
     logging.warn('Could not find a chrome on ' % cri.hostname)
 
   return [PossibleCrOSBrowser('cros-chrome', options, False, cri)]