[chrome_remote_control] Add pylint to PRESUMMIT and fix lint

tools/chrome_remote_control/chrome_remote_control/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 browsers that can be controlled by chrome_remote_control."""
+
 import logging
 
 from chrome_remote_control import android_browser_finder
 from chrome_remote_control import cros_browser_finder
 from chrome_remote_control import desktop_browser_finder
 
-"""Finds browsers that can be controlled by chrome_remote_control."""
-
 ALL_BROWSER_TYPES = (
     desktop_browser_finder.ALL_BROWSER_TYPES + ',' +
     android_browser_finder.ALL_BROWSER_TYPES + ',' +
     cros_browser_finder.ALL_BROWSER_TYPES)
 
 class BrowserTypeRequiredException(Exception):
   pass
 
 def FindBrowser(options):
   """Finds the best PossibleBrowser object to run given the provided
@@ skipping 42 matching lines @@
   """Returns an array of browser types supported on this system."""
   browsers = []
   browsers.extend(desktop_browser_finder.FindAllAvailableBrowsers(options))
   browsers.extend(android_browser_finder.FindAllAvailableBrowsers(options))
   browsers.extend(cros_browser_finder.FindAllAvailableBrowsers(options))
 
   type_list = set([browser.browser_type for browser in browsers])
   type_list = list(type_list)
   type_list.sort()
   return type_list