[chromeos] Fix a use-after-free problem with LoginEventObserver

chrome/browser/automation/automation_event_observers.h

 // 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.
 
 #ifndef CHROME_BROWSER_AUTOMATION_AUTOMATION_EVENT_OBSERVERS_H_
 #define CHROME_BROWSER_AUTOMATION_AUTOMATION_EVENT_OBSERVERS_H_
 
 #include "base/compiler_specific.h"
 #include "base/values.h"
 #include "chrome/browser/automation/automation_event_queue.h"
 #include "chrome/browser/automation/automation_provider.h"
 #include "chrome/browser/automation/automation_provider_observers.h"
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/login_status_consumer.h"
 #endif  // defined(OS_CHROMEOS)
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-#if defined(OS_CHROMEOS)
-namespace chromeos {
-class ExistingUserController;
-}
-#endif  // defined(OS_CHROMEOS)
-
 // AutomationEventObserver watches for a specific event, and pushes an
 // AutomationEvent into the AutomationEventQueue for each occurance.
 class AutomationEventObserver {
  public:
   explicit AutomationEventObserver(AutomationEventQueue* event_queue,
                                    bool recurring);
   virtual ~AutomationEventObserver();
 
   virtual void Init(int observer_id);
   void NotifyEvent(DictionaryValue* value);
@@ skipping 45 matching lines @@
 
 #if defined(OS_CHROMEOS)
 
 // Event observer that listens for the completion of login.
 class LoginEventObserver
     : public AutomationEventObserver,
       public chromeos::LoginStatusConsumer,
       public content::NotificationObserver {
  public:
   LoginEventObserver(AutomationEventQueue* event_queue,
-                     chromeos::ExistingUserController* controller,
                      AutomationProvider* automation);
   virtual ~LoginEventObserver();
 
   virtual void OnLoginFailure(const chromeos::LoginFailure& error) OVERRIDE;
 
   virtual void OnLoginSuccess(const std::string& username,
                               const std::string& password,
                               bool pending_requests, bool using_oauth) OVERRIDE;
   // Overridden from content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
-  chromeos::ExistingUserController* controller_;
   base::WeakPtr<AutomationProvider> automation_;
   content::NotificationRegistrar registrar_;
 
   void _NotifyLoginEvent(const std::string& error_string);
 
   DISALLOW_COPY_AND_ASSIGN(LoginEventObserver);
 };
 
 #endif  // defined(OS_CHROMEOS)
 
 #endif  // CHROME_BROWSER_AUTOMATION_AUTOMATION_EVENT_OBSERVERS_H_