[telemetry] Consolidate global hooks.

tools/telemetry/telemetry/page/page_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 collections
 import copy
 import glob
 import logging
 import os
 import random
 import sys
 import tempfile
 import time
 import traceback
 
 from telemetry import decorators
-from telemetry import exception_formatter
 from telemetry.core import browser_finder
 from telemetry.core import exceptions
 from telemetry.core import util
 from telemetry.core import wpr_modes
 from telemetry.core.platform.profiler import profiler_finder
 from telemetry.page import page_filter
 from telemetry.page import page_runner_repeat
 from telemetry.page import page_test
 from telemetry.page import results_options
 from telemetry.page.actions import navigate
 from telemetry.page.actions import page_action
+from telemetry.util import exception_formatter
 
 
 class _RunState(object):
   def __init__(self):
     self.browser = None
 
     self._append_to_existing_wpr = False
     self._last_archive_path = None
     self._first_browser = True
     self.first_page = collections.defaultdict(lambda: True)
@@ skipping 495 matching lines @@
     logging.error('Device is thermally throttled before running '
                   'performance tests, results will vary.')
 
 
 def _CheckThermalThrottling(platform):
   if not platform.CanMonitorThermalThrottling():
     return
   if platform.HasBeenThermallyThrottled():
     logging.error('Device has been thermally throttled during '
                   'performance tests, results will vary.')