[Telemetry + tools/perf] Modify the pylint disable message to use symbolic name

tools/perf/page_sets/long_running_idle_google_cases.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.
 
 from telemetry import story
 
 from page_sets import google_pages
 
 IDLE_TIME_IN_SECONDS = 100
 
 def _CreateIdlePageClass(base_page_cls):
-  class DerivedIdlePage(base_page_cls):  # pylint: disable=W0232
+  class DerivedIdlePage(base_page_cls):  # pylint: disable=no-init
     def RunPageInteractions(self, action_runner):
       action_runner.Wait(IDLE_TIME_IN_SECONDS)
   return DerivedIdlePage
 
 
 def _CreateIdleBackgroundPageClass(base_page_cls):
-  class DerivedIdlePage(base_page_cls):  # pylint: disable=W0232
+  class DerivedIdlePage(base_page_cls):  # pylint: disable=no-init
     def RunPageInteractions(self, action_runner):
       action_runner.tab.browser.tabs.New()
       action_runner.Wait(IDLE_TIME_IN_SECONDS)
   return DerivedIdlePage
 
 
 class LongRunningIdleGmailPageSet(story.StorySet):
   def __init__(self):
     super(LongRunningIdleGmailPageSet, self).__init__(
         archive_data_file='data/long_running_idle_gmail_page.json',
         cloud_storage_bucket=story.PARTNER_BUCKET)
     self.AddStory(
         _CreateIdlePageClass(google_pages.GmailPage)(self))
 
 
 class LongRunningIdleGmailBackgroundPageSet(story.StorySet):
   def __init__(self):
     # Reuse the wpr of foreground gmail.
     super(LongRunningIdleGmailBackgroundPageSet, self).__init__(
         archive_data_file='data/long_running_idle_gmail_page.json',
         cloud_storage_bucket=story.PARTNER_BUCKET)
     self.AddStory(
         _CreateIdleBackgroundPageClass(google_pages.GmailPage)(self))