We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/auto_login_infobar_delegate.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/ui/auto_login_infobar_delegate.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 45 matching lines @@
   AutoLoginRedirector(content::WebContents* web_contents,
                       const std::string& args);
   virtual ~AutoLoginRedirector();
 
  private:
   // Overriden from UbertokenConsumer:
   virtual void OnUbertokenSuccess(const std::string& token) OVERRIDE;
   virtual void OnUbertokenFailure(const GoogleServiceAuthError& error) OVERRIDE;
 
   // Implementation of content::WebContentsObserver
-  virtual void WebContentsDestroyed(
-      content::WebContents* web_contents) OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
   // Redirect tab to MergeSession URL, logging the user in and navigating
   // to the desired page.
   void RedirectToMergeSession(const std::string& token);
 
   const std::string args_;
   scoped_ptr<UbertokenFetcher> ubertoken_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoLoginRedirector);
 };
@@ skipping 12 matching lines @@
   ubertoken_fetcher_.reset(new UbertokenFetcher(token_service,
                                                 this,
                                                 profile->GetRequestContext()));
   ubertoken_fetcher_->StartFetchingToken(
       signin_manager->GetAuthenticatedAccountId());
 }
 
 AutoLoginRedirector::~AutoLoginRedirector() {
 }
 
-void AutoLoginRedirector::WebContentsDestroyed(
-    content::WebContents* web_contents) {
+void AutoLoginRedirector::WebContentsDestroyed() {
   // The WebContents that started this has been destroyed. The request must be
   // cancelled and this object must be deleted.
   ubertoken_fetcher_.reset();
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }
 
 void AutoLoginRedirector::OnUbertokenSuccess(const std::string& token) {
   RedirectToMergeSession(token);
   base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }
@@ skipping 119 matching lines @@
       web_contents->GetBrowserContext())->GetPrefs();
   pref_service->SetBoolean(prefs::kAutologinEnabled, false);
   RecordHistogramAction(REJECTED);
   button_pressed_ = true;
   return true;
 }
 
 void AutoLoginInfoBarDelegate::GoogleSignedOut(const std::string& username) {
   infobar()->RemoveSelf();
 }