Use PrefChangeRegistrar everywhere

chrome/browser/dom_ui/ntp_resource_cache.h

Index: chrome/browser/dom_ui/ntp_resource_cache.h
diff --git a/chrome/browser/dom_ui/ntp_resource_cache.h b/chrome/browser/dom_ui/ntp_resource_cache.h
index f669325a227794d002660cca13ec7ba9467e558c..3cdc3e5d30f960e48ad5bed57aba6c9155364927 100644
--- a/chrome/browser/dom_ui/ntp_resource_cache.h
+++ b/chrome/browser/dom_ui/ntp_resource_cache.h
@@ -10,6 +10,7 @@
 #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;
@@ -19,7 +20,7 @@ class RefCountedBytes;
 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);
@@ -43,6 +44,7 @@ class NTPResourceCache : public NotificationObserver {
   scoped_refptr<RefCountedBytes> new_tab_css_;
 
   NotificationRegistrar registrar_;
+  PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPResourceCache);
 };