Use PrefChangeRegistrar everywhere

chrome/browser/views/options/general_page_view.h

Index: chrome/browser/views/options/general_page_view.h
diff --git a/chrome/browser/views/options/general_page_view.h b/chrome/browser/views/options/general_page_view.h
index 93a7af5ee15a90f8ce3e5bde48c06896533b3914..f2b126f6d0cabba23433c5c4082d8ec94ff71871 100644
--- a/chrome/browser/views/options/general_page_view.h
+++ b/chrome/browser/views/options/general_page_view.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_VIEWS_OPTIONS_GENERAL_PAGE_VIEW_H_
 #pragma once
 
+#include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/browser/views/options/options_page_view.h"
@@ -156,6 +157,8 @@ class GeneralPageView : public OptionsPageView,
   // The helper object that performs default browser set/check tasks.
   scoped_refptr<ShellIntegration::DefaultBrowserWorker> default_browser_worker_;
 
+  PrefChangeRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(GeneralPageView);
 };