Use PrefChangeRegistrar everywhere

chrome/browser/gtk/gtk_theme_provider.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/gtk/gtk_theme_provider.h"
 
 #include <gtk/gtk.h>
 
 #include <set>
 
@@ skipping 240 matching lines @@
   // Only realized widgets receive style-set notifications, which we need to
   // broadcast new theme images and colors. Only realized widgets have style
   // properties, too, which we query for some colors.
   gtk_widget_realize(fake_frame_);
   gtk_widget_realize(fake_window_);
   signals_->Connect(fake_frame_, "style-set",
                     G_CALLBACK(&OnStyleSetThunk), this);
 }
 
 GtkThemeProvider::~GtkThemeProvider() {
-  profile()->GetPrefs()->RemovePrefObserver(prefs::kUsesSystemTheme, this);
   gtk_widget_destroy(fake_window_);
   gtk_widget_destroy(fake_frame_);
   fake_label_.Destroy();
   fake_entry_.Destroy();
   fake_menu_item_.Destroy();
 
   FreeIconSets();
 
   // We have to call this because FreePlatformCached() in ~BrowserThemeProvider
   // doesn't call the right virutal FreePlatformCaches.
   FreePlatformCaches();
 }
 
 void GtkThemeProvider::Init(Profile* profile) {
-  profile->GetPrefs()->AddPrefObserver(prefs::kUsesSystemTheme, this);
+  registrar_.Init(profile->GetPrefs());
+  registrar_.Add(prefs::kUsesSystemTheme, this);
   use_gtk_ = profile->GetPrefs()->GetBoolean(prefs::kUsesSystemTheme);
 
   BrowserThemeProvider::Init(profile);
 }
 
 SkBitmap* GtkThemeProvider::GetBitmapNamed(int id) const {
   // Try to get our cached version:
   ImageCache::const_iterator it = gtk_images_.find(id);
   if (it != gtk_images_.end())
     return it->second;
@@ skipping 760 matching lines @@
   cairo_set_line_width(cr, 1.0);
   cairo_move_to(cr, start_x, widget->allocation.y);
   cairo_line_to(cr, start_x,
                     widget->allocation.y + widget->allocation.height);
   cairo_stroke(cr);
   cairo_destroy(cr);
   cairo_pattern_destroy(pattern);
 
   return TRUE;
 }