[telemetry] Cleanups for benchmarks importing page sets.

tools/perf/profile_creators/small_profile_creator.py

 # Copyright 2013 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
+from telemetry.page import profile_creator
 
-from telemetry.core import util
-from telemetry.page import page_set
-from telemetry.page import profile_creator
+import page_sets
 
 
 class SmallProfileCreator(profile_creator.ProfileCreator):
   """
   Runs a browser through a series of operations to fill in a small test profile.
   """
 
   def __init__(self):
     super(SmallProfileCreator, self).__init__()
-    typical_25 = os.path.join(util.GetBaseDir(), 'page_sets', 'typical_25.py')
-    self._page_set = page_set.PageSet.FromFile(typical_25)
+    self._page_set = page_sets.Typical25()
 
     # Open all links in the same tab save for the last _NUM_TABS links which
     # are each opened in a new tab.
     self._NUM_TABS = 5
 
   def TabForPage(self, page, browser):
     idx = page.page_set.pages.index(page)
     # The last _NUM_TABS pages open a new tab.
     if idx <= (len(page.page_set.pages) - self._NUM_TABS):
       return browser.tabs[0]
     else:
       return browser.tabs.New()
 
   def MeasurePage(self, _, tab, results):
     tab.WaitForDocumentReadyStateToBeComplete()