Use PrefChangeRegistrar everywhere

chrome/browser/tab_contents/tab_contents.h

Index: chrome/browser/tab_contents/tab_contents.h
diff --git a/chrome/browser/tab_contents/tab_contents.h b/chrome/browser/tab_contents/tab_contents.h
index 90ded2e420cfb2a0491011c24f9281da7b45be32..d37aab824040c3047cf7d16db577082680c7da7d 100644
--- a/chrome/browser/tab_contents/tab_contents.h
+++ b/chrome/browser/tab_contents/tab_contents.h
@@ -24,6 +24,7 @@
 #include "chrome/browser/find_bar_controller.h"
 #include "chrome/browser/find_notification_details.h"
 #include "chrome/browser/jsmessage_box_client.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/password_manager/password_manager_delegate.h"
 #include "chrome/browser/renderer_host/render_view_host_delegate.h"
 #include "chrome/browser/tab_contents/constrained_window.h"
@@ -1057,6 +1058,9 @@ class TabContents : public PageNavigator,
   // Registers and unregisters us for notifications.
   NotificationRegistrar registrar_;
 
+  // Registers and unregisters for pref notifications.
+  PrefChangeRegistrar pref_change_registrar_;
+
   // Handles print preview and print job for this contents.
   scoped_ptr<printing::PrintViewManager> printing_;