[Android] Remove all references to pylib from telemetry.

tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py

 # Copyright 2015 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 os
 import random
 import re
 import sys
 
 from telemetry.core import exceptions
 from telemetry.core import util
 from telemetry.internal.backends.mandoline import android
 from telemetry.internal.backends.mandoline import config
 from telemetry.internal.backends.mandoline import mandoline_browser_backend
 from telemetry.internal.platform import android_platform_backend as \
   android_platform_backend_module
 
 try:
-  from pylib import constants
+  from devil.android.sdk import keyevent
 except ImportError:
   pass
 
 class AndroidMandolineBackend(
     mandoline_browser_backend.MandolineBrowserBackend):
   """The backend for controlling a mandoline browser instance running on
   Android."""
 
   def __init__(self, android_platform_backend, browser_options, target_arch,
                browser_type, build_path, package, chrome_root):
@@ skipping 53 matching lines @@
                                      apk_name='Mandoline.apk')
     shell = android.AndroidShell(mandoline_config, self._chrome_root)
     shell.InitShell(self.device)
 
     output = sys.stdout
     if not self.browser_options.show_stdout:
       output = open(os.devnull, 'w')
     logging_process = shell.ShowLogs(output)
 
     # Unlock device screen.
-    self.device.SendKeyEvent(constants.keyevent.KEYCODE_MENU)
+    self.device.SendKeyEvent(keyevent.KEYCODE_MENU)
     shell.StartActivity(self.activity, args, output, logging_process.terminate)
 
     try:
       self._WaitForBrowserToComeUp()
       self._InitDevtoolsClientBackend(self._port)
     except exceptions.BrowserGoneException:
       logging.critical('Failed to connect to browser.')
       self.Close()
       raise
     except:
@@ skipping 82 matching lines @@
     # The range of ephemeral ports on Android.
     dynamic_port_begin = 32768
     dynamic_port_end = 61000
     assert len(used_ports) < dynamic_port_end - dynamic_port_begin + 1
 
     available_port = random.randint(dynamic_port_begin, dynamic_port_end)
     while available_port in used_ports:
       available_port = random.randint(dynamic_port_begin, dynamic_port_end)
 
     return available_port