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

tools/perf/page_sets/pregenerated_profile_shared_state.py

 # Copyright 2016 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 logging
 import os
 import shutil
 import sys
 import tempfile
 import zipfile
 
-from catapult_base import cloud_storage
+from py_utils import cloud_storage
 
 from telemetry.page import shared_page_state
 
 
 class PregeneratedProfileSharedState(shared_page_state.SharedPageState):
   def __init__(self, test, finder_options, story_set):
     super(PregeneratedProfileSharedState, self).__init__(
         test, finder_options, story_set)
     self._unzipped_profile = None
     self._migrated_profile = None
@@ skipping 126 matching lines @@
     logging.info("Starting migration of pre-generated profile to %s",
                  self._migrated_profile)
     pregenerated_profile = self._finder_options.browser_options.profile_dir
 
     possible_browser = self._FindBrowser(self._finder_options)
     self._MigrateProfile(self._finder_options, possible_browser,
                          pregenerated_profile, self._migrated_profile)
     self._finder_options.browser_options.profile_dir = self._migrated_profile
     logging.info("Finished migration of pre-generated profile to %s",
                  self._migrated_profile)