Update Windows UI on system color changes.

chrome/browser/ui/libgtk2ui/gtk2_ui.cc

 // Copyright (c) 2012 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/ui/libgtk2ui/gtk2_ui.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
@@ skipping 659 matching lines @@
 
   return out_font_name;
 }
 
 ui::SelectFileDialog* Gtk2UI::CreateSelectFileDialog(
     ui::SelectFileDialog::Listener* listener,
     ui::SelectFilePolicy* policy) const {
   return SelectFileDialogImpl::Create(listener, policy);
 }
 
-void Gtk2UI::AddNativeThemeChangeObserver(
-    views::NativeThemeChangeObserver* observer) {
-  theme_change_observers_.AddObserver(observer);
-}
-
-void Gtk2UI::RemoveNativeThemeChangeObserver(
-    views::NativeThemeChangeObserver* observer) {
-  theme_change_observers_.RemoveObserver(observer);
-}
-
 bool Gtk2UI::UnityIsRunning() {
   return unity::IsRunning();
 }
 
 views::LinuxUI::NonClientMiddleClickAction
 Gtk2UI::GetNonClientMiddleClickAction() {
   return middle_click_action_;
 }
 
 void Gtk2UI::NotifyWindowManagerStartupComplete() {
@@ skipping 684 matching lines @@
   gtk_widget_destroy(window);
 }
 
 void Gtk2UI::ClearAllThemeData() {
   gtk_images_.clear();
 }
 
 void Gtk2UI::OnStyleSet(GtkWidget* widget, GtkStyle* previous_style) {
   ClearAllThemeData();
   LoadGtkValues();
-
-  FOR_EACH_OBSERVER(views::NativeThemeChangeObserver, theme_change_observers_,
-                    OnNativeThemeChanged());
+  NativeThemeGtk2::instance()->NotifyNativeThemeObservers();
 }
 
 }  // namespace libgtk2ui
 
 views::LinuxUI* BuildGtk2UI() {
   return new libgtk2ui::Gtk2UI;
 }