Get rid of device/host clock synchronization in android_commands.py.

build/android/pylib/base_test_runner.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 contextlib
 import httplib
 import logging
 import os
 import tempfile
 import time
@@ skipping 23 matching lines @@
   def __init__(self, device, tool, shard_index, build_type):
     """
       Args:
         device: Tests will run on the device of this ID.
         shard_index: Index number of the shard on which the test suite will run.
         build_type: 'Release' or 'Debug'.
     """
     self.device = device
     self.adb = android_commands.AndroidCommands(device=device)
     self.tool = CreateTool(tool, self.adb)
-    # Synchronize date/time between host and device. Otherwise same file on
-    # host and device may have different timestamp which may cause
-    # AndroidCommands.PushIfNeeded failed, or a test which may compare timestamp
-    # got from http head and local time could be failed.
-    self.adb.SynchronizeDateTime()
     self._http_server = None
     self._forwarder = None
     self._forwarder_device_port = 8000
     self.forwarder_base_url = ('http://localhost:%d' %
         self._forwarder_device_port)
     self.flags = FlagChanger(self.adb)
     self.shard_index = shard_index
     self.flags.AddFlags(['--disable-fre'])
     self._spawning_server = None
     self._spawner_forwarder = None
@@ skipping 169 matching lines @@
       # Wait for 2 seconds then restart.
       time.sleep(2)
     if not server_ready:
       logging.error(';'.join(error_msgs))
       raise Exception('Can not start the test spawner server.')
     self._PushTestServerPortInfoToDevice()
     self._spawner_forwarder = Forwarder(
         self.adb,
         [(self.test_server_spawner_port, self.test_server_spawner_port)],
         self.tool, '127.0.0.1', self.build_type)