[Android] Switch to DeviceUtils versions of file functions.

build/android/pylib/base/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.
 
 """Base class for running tests on a single device."""
 
 import logging
 import time
 
 from pylib import ports
@@ skipping 33 matching lines @@
     # We will allocate port for test server spawner when calling method
     # LaunchChromeTestServerSpawner and allocate port for test server when
     # starting it in TestServerThread.
     self.test_server_spawner_port = 0
     self.test_server_port = 0
     self._push_deps = push_deps
     self._cleanup_test_files = cleanup_test_files
 
   def _PushTestServerPortInfoToDevice(self):
     """Pushes the latest port information to device."""
-    self.device.old_interface.SetFileContents(
+    self.device.WriteFile(
         self.device.GetExternalStoragePath() + '/' +
             NET_TEST_SERVER_PORT_INFO_FILE,
         '%d:%d' % (self.test_server_spawner_port, self.test_server_port))
 
   def RunTest(self, test):
     """Runs a test. Needs to be overridden.
 
     Args:
       test: A test to run.
 
@@ skipping 127 matching lines @@
         break
       else:
         error_msgs.append(error_msg)
       self._spawning_server.Stop()
       # 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()