Remove RenderViewHost parameter from WebContentsObserver::Did{Start|Stop}Loading.

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.h"
 #include "base/time/time.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
@@ skipping 82 matching lines @@
   PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
   if (!prerender_manager)
     return;
   if (prerender_manager->IsWebContentsPrerendering(web_contents(), NULL))
     return;
   prerender_manager->RecordNavigation(validated_url);
   ReportTabHelperURLSeenToLocalPredictor(prerender_manager, validated_url,
                                          web_contents());
 }
 
-void PrerenderTabHelper::DidStopLoading(
-    content::RenderViewHost* render_view_host) {
+void PrerenderTabHelper::DidStopLoading() {
   // Compute the PPLT metric and report it in a histogram, if needed. If the
   // page is still prerendering, record the not swapped in page load time
   // instead.
   if (!pplt_load_start_.is_null()) {
     base::TimeTicks now = base::TimeTicks::Now();
     if (IsPrerendering()) {
       PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
       if (prerender_manager) {
         prerender_manager->RecordPageLoadTimeNotSwappedIn(
             origin_, now - pplt_load_start_, url_);
@@ skipping 151 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