GTK: Make the gtk port compile with GTK_DISABLE_SINGLE_INCLUDES.

chrome/browser/ui/gtk/chrome_gtk_frame.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_CHROME_GTK_FRAME_H_
 #define CHROME_BROWSER_UI_GTK_CHROME_GTK_FRAME_H_
 #pragma once
 
-#include <gdk/gdk.h>
-#include <gtk/gtkwindow.h>
+#include <gtk/gtk.h>
 
 G_BEGIN_DECLS
 
 // This file declares two subclasses of GtkWindow for easier gtk+ theme
 // integration.
 //
 // The first is "MetaFrames," which is (was?) the name of a gobject class in
 // the metacity window manager. To actually get at those values, we need to
 // have an object whose gobject class name string matches the definitions in
 // the gtkrc file. MetaFrames derives from GtkWindow.
@@ skipping 26 matching lines @@
 struct _ChromeGtkFrameClass {
   MetaFramesClass frames_class;
 };
 
 // Creates a GtkWindow object the the class name "ChromeGtkFrame".
 GtkWidget* chrome_gtk_frame_new();
 
 G_END_DECLS
 
 #endif  // CHROME_BROWSER_UI_GTK_CHROME_GTK_FRAME_H_