Don't WaitForNavigate in memory.blink_memory_mobile benchmark.

tools/perf/page_sets/blink_memory_mobile.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.
 
 import logging
 
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
@@ skipping 63 matching lines @@
   def __init__(self, page_set):
     super(GmailPage, self).__init__(
         'https://mail.google.com/mail/',
         page_set=page_set,
         name='Gmail')
 
   def RunNavigateSteps(self, action_runner):
     google_login.LoginGoogleAccount(action_runner, 'google',
                                     self.credentials_path)
     super(GmailPage, self).RunNavigateSteps(action_runner)
-    # Needs to wait for navigation to handle redirects.
-    action_runner.WaitForNavigate()
     action_runner.WaitForElement(selector='#apploadingdiv')
     action_runner.WaitForJavaScriptCondition(
         'document.querySelector("#apploadingdiv").style.opacity == "0"')
 
 
 class BlinkMemoryMobilePageSet(story.StorySet):
   """Key mobile sites for Blink memory reduction."""
 
   def __init__(self):
     super(BlinkMemoryMobilePageSet, self).__init__(
@@ skipping 31 matching lines @@
     # Why: Key products.
     self.AddStory(GmailPage(page_set=self))
     self.AddStory(BlinkMemoryMobilePage(
         'http://googlewebmastercentral.blogspot.com/2015/04/rolling-out-mobile-friendly-update.html?m=1',
         page_set=self,
         name='Blogger'))
     self.AddStory(BlinkMemoryMobilePage(
         'https://plus.google.com/app/basic/110031535020051778989/posts?source=apppromo',
         page_set=self,
         name='GooglePlus'))