Use PrefChangeRegistrar everywhere

chrome/browser/dom_ui/ntp_resource_cache.h

 // Copyright (c) 2010 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_DOM_UI_NTP_RESOURCE_CACHE_H_
 #define CHROME_BROWSER_DOM_UI_NTP_RESOURCE_CACHE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
 
 class Profile;
 class RefCountedBytes;
 
 // This class keeps a cache of NTP resources (HTML and CSS) so we don't have to
 // regenerate them all the time.
 class NTPResourceCache : public NotificationObserver {
  public:
   explicit NTPResourceCache(Profile* profile);
-  virtual ~NTPResourceCache();
+  virtual ~NTPResourceCache() {}
 
   RefCountedBytes* GetNewTabHTML(bool is_off_the_record);
   RefCountedBytes* GetNewTabCSS(bool is_off_the_record);
 
   // NotificationObserver interface.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
   Profile* profile_;
 
   void CreateNewTabIncognitoHTML();
   scoped_refptr<RefCountedBytes> new_tab_incognito_html_;
   void CreateNewTabHTML();
   scoped_refptr<RefCountedBytes> new_tab_html_;
 
   void CreateNewTabIncognitoCSS();
   scoped_refptr<RefCountedBytes> new_tab_incognito_css_;
   void CreateNewTabCSS();
   scoped_refptr<RefCountedBytes> new_tab_css_;
 
   NotificationRegistrar registrar_;
+  PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPResourceCache);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_NTP_RESOURCE_CACHE_H_