Use PrefChangeRegistrar everywhere

chrome/browser/gtk/gtk_theme_provider.h

Index: chrome/browser/gtk/gtk_theme_provider.h
diff --git a/chrome/browser/gtk/gtk_theme_provider.h b/chrome/browser/gtk/gtk_theme_provider.h
index 33b1ec25200ecd692d07af8c8510857802e31869..2ecef7aa3a1b2dbbc9bccad055446ad10251b3ea 100644
--- a/chrome/browser/gtk/gtk_theme_provider.h
+++ b/chrome/browser/gtk/gtk_theme_provider.h
@@ -12,6 +12,7 @@
 #include "app/gtk_integers.h"
 #include "app/gtk_signal.h"
 #include "base/scoped_ptr.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/browser/gtk/owned_widget_gtk.h"
 #include "chrome/browser/themes/browser_theme_provider.h"
 #include "chrome/common/notification_observer.h"
@@ -275,6 +276,8 @@ class GtkThemeProvider : public BrowserThemeProvider,
   PerDisplaySurfaceMap per_display_surfaces_;
   PerDisplaySurfaceMap per_display_unthemed_surfaces_;
 
+  PrefChangeRegistrar registrar_;
+
   // This is a dummy widget that only exists so we have something to pass to
   // gtk_widget_render_icon().
   static GtkWidget* icon_widget_;