Added integration test to Chrome Proxy to verify fallback to HTTP after bad HTTPS response from pro…

tools/chrome_proxy/integration_tests/chrome_proxy_pagesets/bad_https_fallback.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 telemetry.page import page as page_module
 from telemetry import story
 
 
-class HTML5TestPage(page_module.Page):
+class BadHTTPSFallbackPage(page_module.Page):
 
   def __init__(self, url, page_set):
-    super(HTML5TestPage, self).__init__(url=url, page_set=page_set)
+    super(BadHTTPSFallbackPage, self).__init__(url=url, page_set=page_set)
 
 
-class HTML5TestStorySet(story.StorySet):
+class BadHTTPSFallbackStorySet(story.StorySet):
 
   """ Chrome proxy test page for traffic over https. """
 
   def __init__(self):
-    super(HTML5TestStorySet, self).__init__()
+    super(BadHTTPSFallbackStorySet, self).__init__()
 
     urls_list = [
-      'http://html5test.com/',
+      'http://check.googlezip.net/test.html'
     ]
 
     for url in urls_list:
-      self.AddStory(HTML5TestPage(url, self))
+      self.AddStory(BadHTTPSFallbackPage(url, self))