Remove calls of PrerenderTracker::TryCancel on UI thread and instead have them call PrerenderConten…

chrome/browser/prerender/prerender_manager.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_manager.h"
 
 #include <algorithm>
 #include <functional>
 #include <string>
 #include <vector>
@@ skipping 1736 matching lines @@
   CookieChanged(content::Details<ChromeCookieDetails>(details).ptr());
 }
 
 void PrerenderManager::OnCreatingAudioStream(int render_process_id,
                                              int render_view_id) {
   WebContents* tab = tab_util::GetWebContentsByID(
       render_process_id, render_view_id);
   if (!tab)
     return;
 
-  if (!IsWebContentsPrerendering(tab, NULL))
+  PrerenderContents* prerender_contents = GetPrerenderContents(tab);
+  if (!prerender_contents)
     return;
 
-  prerender_tracker()->TryCancel(
-      render_process_id, render_view_id,
-      prerender::FINAL_STATUS_CREATING_AUDIO_STREAM);
+  prerender_contents->Destroy(prerender::FINAL_STATUS_CREATING_AUDIO_STREAM);
 }
 
 void PrerenderManager::RecordLikelyLoginOnURL(const GURL& url) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (!url.SchemeIsHTTPOrHTTPS())
     return;
   if (logged_in_predictor_table_.get()) {
     BrowserThread::PostTask(
         BrowserThread::DB,
         FROM_HERE,
@@ skipping 95 matching lines @@
 void PrerenderManager::RecordEvent(PrerenderContents* contents,
                                    PrerenderEvent event) const {
   if (!contents)
     histograms_->RecordEvent(ORIGIN_NONE, kNoExperiment, event);
   else
     histograms_->RecordEvent(contents->origin(), contents->experiment_id(),
                              event);
 }
 
 }  // namespace prerender