We have a problem in the process on destroying WebContentsImpl because

chrome/browser/guest_view/guest_view_manager.cc

 // Copyright 2014 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/guest_view/guest_view_manager.h"
 
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/guest_view/guest_view_base.h"
 #include "chrome/browser/guest_view/guest_view_constants.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 30 matching lines @@
       bool is_main_frame,
       const GURL& validated_url,
       bool is_error_page,
       bool is_iframe_srcdoc,
       content::RenderViewHost* render_view_host) OVERRIDE {
     GuestViewManager::FromBrowserContext(web_contents()->GetBrowserContext())->
         AddRenderProcessHostID(web_contents()->GetRenderProcessHost()->GetID());
     delete this;
   }
 
-  virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE {
+  virtual void WebContentsDestroyed() OVERRIDE {
     delete this;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GuestWebContentsObserver);
 };
 
 GuestViewManager::GuestViewManager(content::BrowserContext* context)
     : current_instance_id_(0),
       context_(context) {}
@@ skipping 152 matching lines @@
       return false;
 
     return embedder_render_process_id ==
         guest->GetOpener()->GetEmbedderWebContents()->GetRenderProcessHost()->
             GetID();
   }
 
   return embedder_render_process_id ==
       guest->embedder_web_contents()->GetRenderProcessHost()->GetID();
 }