[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/profile_creators/history_profile_extender_unittest.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 os
 import shutil
 import tempfile
 import unittest
 
 from profile_creators.history_profile_extender import HistoryProfileExtender
+from telemetry.core import util
 from telemetry import decorators
-from telemetry.core import util
 from telemetry.unittest_util import options_for_unittests
 
 util.AddDirToPythonPath(util.GetTelemetryDir(), 'third_party', 'mock')
 import mock
 
 
 # Testing private method.
 # pylint: disable=protected-access
 class HistoryProfileExtenderTest(unittest.TestCase):
   # The profile extender does not work on Android or ChromeOS.
@@ skipping 13 matching lines @@
     try:
       extender.Run(options)
       self.assertEquals(extender.profile_path, options.output_profile_path)
       self.assertTrue(os.path.exists(extender.profile_path))
       history_db_path = os.path.join(extender.profile_path, "Default",
           "History")
       stat_info = os.stat(history_db_path)
       self.assertGreater(stat_info.st_size, 1000)
     finally:
       shutil.rmtree(options.output_profile_path)