Use PrefChangeRegistrar everywhere

chrome/browser/dom_ui/core_options_handler.h

Index: chrome/browser/dom_ui/core_options_handler.h
diff --git a/chrome/browser/dom_ui/core_options_handler.h b/chrome/browser/dom_ui/core_options_handler.h
index 748ab837326a509ee932efc117d41ef643497ba7..fd94d104f4667dc255853fc3995ea4e371ed41a6 100644
--- a/chrome/browser/dom_ui/core_options_handler.h
+++ b/chrome/browser/dom_ui/core_options_handler.h
@@ -11,6 +11,7 @@
 
 #include "base/values.h"
 #include "chrome/browser/dom_ui/options_ui.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
 
 // Core options UI handler.
 // Handles resource and JS calls common to all options sub-pages.
@@ -22,7 +23,6 @@ class CoreOptionsHandler : public OptionsPageUIHandler {
   virtual void GetLocalizedValues(DictionaryValue* localized_strings);
   virtual void Uninitialize();
 
-
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
@@ -30,6 +30,7 @@ class CoreOptionsHandler : public OptionsPageUIHandler {
 
   // DOMMessageHandler implementation.
   virtual void RegisterMessages();
+  virtual DOMMessageHandler* Attach(DOMUI* dom_ui);
 
  protected:
   // Fetches a pref value of given |pref_name|.
@@ -87,6 +88,8 @@ class CoreOptionsHandler : public OptionsPageUIHandler {
 
   void NotifyPrefChanged(const std::string* pref_name);
 
+  PrefChangeRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(CoreOptionsHandler);
 };