We have a problem in the process on destroying WebContentsImpl because

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 1101 matching lines @@
         bool is_main_frame,
         const GURL& validated_url,
         int error_code,
         const base::string16& error_description,
         content::RenderViewHost* render_view_host) {
   if (!is_main_frame)
     return;
   prerender_data_->ClearPendingSwap();
 }
 
-void PrerenderManager::PendingSwap::WebContentsDestroyed(
-    content::WebContents* web_contents) {
+void PrerenderManager::PendingSwap::WebContentsDestroyed() {
   prerender_data_->ClearPendingSwap();
 }
 
 void PrerenderManager::PendingSwap::RecordEvent(PrerenderEvent event) const {
   manager_->RecordEvent(prerender_data_->contents(), event);
 }
 
 void PrerenderManager::PendingSwap::OnMergeCompleted(
     SessionStorageNamespace::MergeResult result) {
   UMA_HISTOGRAM_TIMES("Prerender.SessionStorageNamespaceMergeTime",
@@ skipping 688 matching lines @@
   histograms_->RecordNetworkBytes(used, prerender_bytes, recent_profile_bytes);
 }
 
 void PrerenderManager::AddProfileNetworkBytesIfEnabled(int64 bytes) {
   DCHECK_GE(bytes, 0);
   if (IsEnabled() && ActuallyPrerendering())
     profile_network_bytes_ += bytes;
 }
 
 }  // namespace prerender