[NoStatePrefetch] Add performance histograms.

chrome/browser/prerender/prerender_tab_helper.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/prerender/prerender_tab_helper.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/time/time.h"
 #include "chrome/browser/prerender/prerender_histograms.h"
@@ skipping 111 matching lines @@
   }
 
   MainFrameUrlDidChange(validated_url);
 }
 
 void PrerenderTabHelper::MainFrameUrlDidChange(const GURL& url) {
   url_ = url;
 }
 
 PrerenderManager* PrerenderTabHelper::MaybeGetPrerenderManager() const {
-  return PrerenderManagerFactory::GetForProfile(
-      Profile::FromBrowserContext(web_contents()->GetBrowserContext()));
+  return PrerenderManagerFactory::GetForBrowserContext(
+      web_contents()->GetBrowserContext());
 }
 
 bool PrerenderTabHelper::IsPrerendering() {
   PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
   if (!prerender_manager)
     return false;
   return prerender_manager->IsWebContentsPrerendering(web_contents(), NULL);
 }
 
 void PrerenderTabHelper::PrerenderSwappedIn() {
@@ skipping 32 matching lines @@
   prerender_manager->RecordPerceivedPageLoadTime(
       origin_, navigation_type_, perceived_page_load_time,
       fraction_plt_elapsed_at_swap_in, url_);
 
   // Reset state for the next navigation.
   navigation_type_ = NAVIGATION_TYPE_NORMAL;
   origin_ = ORIGIN_NONE;
 }
 
 }  // namespace prerender