[Android][telemetry] Update pylib imports for modules that moved into devil.

build/android/pylib/valgrind_tools.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.
 
 """
 Classes in this file define additional actions that need to be taken to run a
 test under some kind of runtime error detection tool.
 
 The interface is intended to be used as follows.
 
@@ skipping 10 matching lines @@
 Call tool.CleanUpEnvironment().
 """
 # pylint: disable=R0201
 
 import glob
 import logging
 import os.path
 import subprocess
 import sys
 
+from devil.android import device_errors
 from pylib.constants import DIR_SOURCE_ROOT
-from pylib.device import device_errors
 
 
 def SetChromeTimeoutScale(device, scale):
   """Sets the timeout scale in /data/local/tmp/chrome_timeout_scale to scale."""
   path = '/data/local/tmp/chrome_timeout_scale'
   if not scale or scale == 1.0:
     # Delete if scale is None/0.0/1.0 since the default timeout scale is 1.0
     device.RunShellCommand('rm %s' % path)
   else:
     device.WriteFile(path, '%f' % scale, as_root=True)
@@ skipping 248 matching lines @@
     return
 
   clazz = TOOL_REGISTRY.get(tool_name)
   if clazz:
     clazz.CopyFiles(device)
   else:
     print 'Unknown tool %s, available tools: %s' % (
         tool_name, ', '.join(sorted(TOOL_REGISTRY.keys())))
     sys.exit(1)