[chrome_remote_control] Use monkey patching for stubs.

tools/chrome_remote_control/chrome_remote_control/android_browser_finder.py

Index: tools/chrome_remote_control/chrome_remote_control/android_browser_finder.py
diff --git a/tools/chrome_remote_control/chrome_remote_control/android_browser_finder.py b/tools/chrome_remote_control/chrome_remote_control/android_browser_finder.py
index eeb0e2aa319956ff807233edb6275b425ea66e09..5508fabf4e34b9a7849f65d2b44d1635cd75e948 100644
--- a/tools/chrome_remote_control/chrome_remote_control/android_browser_finder.py
+++ b/tools/chrome_remote_control/chrome_remote_control/android_browser_finder.py
@@ -1,13 +1,13 @@
 # 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.
-import os as real_os
-import subprocess as real_subprocess
+import os
 import logging
 import re
+import subprocess
 
+from chrome_remote_control import adb_commands
 from chrome_remote_control import android_browser_backend
-import chrome_remote_control.adb_commands as real_adb_commands
 from chrome_remote_control import browser
 from chrome_remote_control import possible_browser
 
@@ -55,16 +55,14 @@ class PossibleAndroidBrowser(possible_browser.PossibleBrowser):
         self._options, *self._args)
     return browser.Browser(backend)
 
-def FindAllAvailableBrowsers(options,
-                             subprocess=real_subprocess,
-                             adb_commands=real_adb_commands):
+def FindAllAvailableBrowsers(options):
   """Finds all the desktop browsers available on this machine."""
   if not adb_commands.IsAndroidSupported():
     return []
 
   # See if adb even works.
   try:
-    with open(real_os.devnull, 'w') as devnull:
+    with open(os.devnull, 'w') as devnull:
       proc = subprocess.Popen(['adb', 'devices'],
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE,