[Telemetry] Cleanup some unused variables in page_sets.

tools/perf/page_sets/top_25_repaint.py

 # Copyright 2014 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.
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 from page_sets import repaint_helpers
 from page_sets import top_pages
 
 
 class TopRepaintPage(page_module.Page):
 
-  def __init__(self, url, page_set, mode, width, height, name='',
-               credentials=None):
+  def __init__(self, url, page_set, mode, width, height, name=''):
     super(TopRepaintPage, self).__init__(
         url=url, page_set=page_set, name=name,
         credentials_path='data/credentials.json',
         shared_page_state_class=shared_page_state.SharedDesktopPageState)
-    self.archive_data_file = 'data/top_25_repaint.json'
-    self.credentials = credentials
     self._mode = mode
     self._width = width
     self._height = height
 
   def RunPageInteractions(self, action_runner):
     repaint_helpers.Repaint(
         action_runner, mode=self._mode, width=self._width, height=self._height)
 
 
 def _CreatePageClassWithRepaintInteractions(page_cls, mode, width, height):
@@ skipping 56 matching lines @@
         'http://answers.yahoo.com',
         # Why: #1 Alexa sports
         'http://sports.yahoo.com/',
         # Why: top tech blog
         'http://techcrunch.com'
     ]
 
     for url in other_urls:
       self.AddStory(
           TopRepaintPage(url, self, mode=mode, height=height, width=width))