[Telemetry refactor] Drop "2" from method calls to JS API

tools/perf/page_sets/system_health/background_stories.py

 # Copyright 2016 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 page_sets.system_health import platforms
 from page_sets.system_health import story_tags
 from page_sets.system_health import system_health_story
 from page_sets.system_health.loading_stories import LoadGmailMobileStory
 
 from telemetry import decorators
@@ skipping 40 matching lines @@
 
   def _DidLoadDocument(self, action_runner):
     # Dismiss the 'You have n free articles' message.
     action_runner.WaitForElement(selector='.growl-dismiss')
     action_runner.TapElement(selector='.growl-dismiss')
 
     # Tap the 'Show Full Article' button.
     action_runner.WaitForElement(selector='#additional-content button')
     action_runner.ScrollPageToElement(selector='#additional-content button')
     # TapElement seems flaky here so use JavaScript instead.
-    action_runner.ExecuteJavaScript2(
+    action_runner.ExecuteJavaScript(
         'document.querySelector("#additional-content button").click()')
 
     # Scroll to video, start it and then wait for a few seconds.
     action_runner.WaitForElement(selector='.nytd-player-poster')
     action_runner.ScrollPageToElement(selector='.nytd-player-poster')
     # For some reason on some devices (e.g. Nexus7) we don't scroll all the way
     # to the element. I think this might be caused by the page reflowing (due to
     # vidoes loading) during the scroll. To be sure we get to the element
     # wait a moment and then try to scroll again.
     action_runner.Wait(1)
     action_runner.ScrollPageToElement(selector='.nytd-player-poster')
     action_runner.TapElement(selector='.nytd-player-poster')
     action_runner.Wait(_WAIT_FOR_VIDEO_SECONDS)
 
 
 class BackgroundImgurMobileStory(_BackgroundStory):
   NAME = 'background:media:imgur'
   URL = 'http://imgur.com/gallery/hUita'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
 
 @decorators.Disabled('android')  # crbug.com/676336
 class BackgroundGmailMobileStory(LoadGmailMobileStory):
   NAME = 'background:tools:gmail'
   SUPPORTED_PLATFORMS = platforms.MOBILE_ONLY
 
   def _Measure(self, action_runner):
     action_runner.tab.browser.Background()
     super(BackgroundGmailMobileStory, self)._Measure(action_runner)