We have a problem in the process on destroying WebContentsImpl because

chrome/browser/guest_view/web_view/web_view_guest.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/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/web_request/web_request_api.h"
@@ skipping 730 matching lines @@
     content::RenderViewHost* render_view_host) {
   if (frame_id == main_frame_id_)
     InjectChromeVoxIfNeeded(render_view_host);
 }
 
 void WebViewGuest::DidStopLoading(content::RenderViewHost* render_view_host) {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   DispatchEvent(new GuestViewBase::Event(webview::kEventLoadStop, args.Pass()));
 }
 
-void WebViewGuest::WebContentsDestroyed(WebContents* web_contents) {
+void WebViewGuest::WebContentsDestroyed() {
   // Clean up custom context menu items for this guest.
   extensions::MenuManager* menu_manager = extensions::MenuManager::Get(
       Profile::FromBrowserContext(browser_context()));
   menu_manager->RemoveAllContextItems(extensions::MenuItem::ExtensionKey(
       embedder_extension_id(), view_instance_id()));
 
-  RemoveWebViewFromExtensionRendererState(web_contents);
+  RemoveWebViewFromExtensionRendererState(web_contents());
 }
 
 void WebViewGuest::UserAgentOverrideSet(const std::string& user_agent) {
   content::NavigationController& controller =
       guest_web_contents()->GetController();
   content::NavigationEntry* entry = controller.GetVisibleEntry();
   if (!entry)
     return;
   entry->SetIsOverridingUserAgent(!user_agent.empty());
   if (!attached()) {
@@ skipping 245 matching lines @@
     const PermissionResponseCallback& callback,
     BrowserPluginPermissionType permission_type,
     bool allowed_by_default)
     : callback(callback),
       permission_type(permission_type),
       allowed_by_default(allowed_by_default) {
 }
 
 WebViewGuest::PermissionResponseInfo::~PermissionResponseInfo() {
 }