Telemetry: Remove the class ProfileCreator.

tools/perf/profile_creators/fast_navigation_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 time
 
+from profile_creators import profile_extender
 from telemetry.core import browser_finder
 from telemetry.core import browser_finder_exceptions
 from telemetry.core import exceptions
 from telemetry.core import platform
 
 
-class FastNavigationProfileExtender(object):
+class FastNavigationProfileExtender(profile_extender.ProfileExtender):
   """Extends a Chrome profile.
 
   This class creates or extends an existing profile by performing a set of tab
   navigations in large batches. This is accomplished by opening a large number
   of tabs, simultaneously navigating all the tabs, and then waiting for all the
   tabs to load. This provides two benefits:
     - Takes advantage of the high number of logical cores on modern CPUs.
     - The total time spent waiting for navigations to time out scales linearly
       with the number of batches, but does not scale with the size of the
       batch.
@@ skipping 248 matching lines @@
         tab = self._navigation_tabs[i]
         batch.append((tab, url))
 
       queued_tabs = self._BatchNavigateTabs(batch)
       self._WaitForQueuedTabsToLoad(queued_tabs)
 
       self.CleanUpAfterBatchNavigation()
 
       if self.ShouldExitAfterBatchNavigation():
         break