[tools/perf] Update code to reference py_utils.cloud_storage

tools/perf/profile_creators/extension_profile_extender.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 atexit
 import json
 import logging
 import os
 import shutil
 import sys
 import time
 import zipfile
 
 if sys.platform == 'win32':
   import _winreg as winreg  # pylint: disable=import-error
 
-from catapult_base import cloud_storage
 from profile_creators import profile_extender
+from py_utils import cloud_storage
 from telemetry.core import exceptions
 
 
 # Remote target upload directory in cloud storage for extensions.
 REMOTE_DIR = 'extension_set'
 
 # Target zip file.
 ZIP_NAME = 'extensions.zip'
 
 
@@ skipping 137 matching lines @@
   def _WaitForExtensionsToLoad(self):
     """Stall until browser has finished installing/loading all extensions."""
     unloaded_extensions = set(self._extensions)
     while unloaded_extensions:
       loaded_extensions = set([key.extension_id for key in
                                self.browser.extensions.keys()])
       unloaded_extensions = unloaded_extensions - loaded_extensions
       # There's no event signalling when browser finishes installing
       # or loading an extension so re-check every 5 seconds.
       time.sleep(5)