[chrome_remote_control] Add pylint to PRESUMMIT and fix lint

tools/chrome_remote_control/chrome_remote_control/android_browser_finder_unittest.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.
 import logging
 import unittest
 
 from chrome_remote_control import android_browser_finder
 from chrome_remote_control import browser_options
-
-from system_stub import *
+from chrome_remote_control.system_stub import PopenStub
+from chrome_remote_control.system_stub import SubprocessModuleStub
 
 # adb not even found
 # android_browser_finder not returning
 class ADBCommandsStub(object):
   def __init__(self, module, device):
     self._module = module
     self._device = device
     self.is_root_enabled = True
 
   def RunShellCommand(self, args):
     if isinstance(args, basestring):
       import shlex
       args = shlex.split(args)
     handler = self._module.shell_command_handlers[args[0]]
     return handler(args)
 
   def IsRootEnabled(self):
     return self.is_root_enabled
 
 class ADBCommandsModuleStub(object):
   def __init__(self):
     self.attached_devices = []
     self.shell_command_handlers = {}
 
     def ADBCommandsStubConstructor(device=None):
       return ADBCommandsStub(self, device)
     self.ADBCommands = ADBCommandsStubConstructor
 
-  def IsAndroidSupported(self):
+  def IsAndroidSupported(self): # pylint: disable=R0201
     return True
 
   def GetAttachedDevices(self):
     return self.attached_devices
 
-  def HasForwarder(self, adb):
+  def HasForwarder(self, adb): # pylint: disable=W0613,R0201
     return True
 
 class AndroidBrowserFinderTest(unittest.TestCase):
   def test_no_adb(self):
     options = browser_options.BrowserOptions()
 
     subprocess_stub = SubprocessModuleStub()
-    def NoADB(*args, **kargs):
+    def NoADB(*args, **kargs): # pylint: disable=W0613
       raise OSError('not found')
     subprocess_stub.Popen_hook = NoADB
     browsers = android_browser_finder.FindAllAvailableBrowsers(
         options, subprocess_stub)
     self.assertEquals(0, len(browsers))
 
   def test_adb_no_devices(self):
     options = browser_options.BrowserOptions()
 
     subprocess_stub = SubprocessModuleStub()
@@ skipping 81 matching lines @@
       assert args[1] == 'list'
       assert args[2] == 'packages'
       return ['package:org.chromium.content_shell',
               'package.com.google.android.setupwizard']
 
     adb_commands_module_stub.shell_command_handlers['pm'] = OnPM
 
     browsers = android_browser_finder.FindAllAvailableBrowsers(
         options, subprocess_stub, adb_commands_module_stub)
     self.assertEquals(1, len(browsers))