Delete all_page_actions, which is now empty.

tools/perf/page_sets/tough_image_cases.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.
-# pylint: disable=W0401,W0614
-from telemetry.page.actions.all_page_actions import *
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class ToughImageCasesPage(page_module.Page):
 
   def __init__(self, url, page_set):
     super(ToughImageCasesPage, self).__init__(url=url, page_set=page_set)
     self.user_agent_type = 'desktop'
 
 
 class ToughImageCasesPageSet(page_set_module.PageSet):
 
   """ A collection of image-heavy sites. """
 
   def __init__(self):
     super(ToughImageCasesPageSet, self).__init__(
       user_agent_type='desktop')
 
     urls_list = [
       'http://www.free-pictures-photos.com/aviation/airplane-306.jpg',
       ('http://upload.wikimedia.org/wikipedia/commons/c/cb/'
        'General_history%2C_Alaska_Yukon_Pacific_Exposition%'
        '2C_fully_illustrated_-_meet_me_in_Seattle_1909_-_Page_78.jpg')
     ]
 
     for url in urls_list:
       self.AddPage(ToughImageCasesPage(url, self))