GTK: Make the gtk port compile with GTK_DISABLE_SINGLE_INCLUDES.

chrome/browser/ui/gtk/gtk_custom_menu_item.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_GTK_CUSTOM_MENU_ITEM_H_
 #define CHROME_BROWSER_UI_GTK_GTK_CUSTOM_MENU_ITEM_H_
 #pragma once
 
 // GtkCustomMenuItem is a GtkMenuItem subclass that has buttons in it and acts
 // to support this. GtkCustomMenuItems only render properly when put in a
@@ skipping 12 matching lines @@
 // selected (due to key events and mouse movement) and otherwise acts like a
 // normal GtkItem. The buttons are only for sizing and rendering; they don't
 // respond to events. Instead, when the GtkCustomMenuItem is activated by the
 // GtkMenu, it uses which button was selected as a signal of what to do.
 //
 // Users should connect to the "button-pushed" signal to be notified when a
 // button was pushed. We don't go through the normal "activate" signal because
 // we need to communicate additional information, namely which button was
 // activated.
 
-#include <gdk/gdk.h>
 #include <gtk/gtk.h>
 
 G_BEGIN_DECLS
 
 #define GTK_TYPE_CUSTOM_MENU_ITEM                                       \
   (gtk_custom_menu_item_get_type())
 #define GTK_CUSTOM_MENU_ITEM(obj)                                       \
   (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_TYPE_CUSTOM_MENU_ITEM,         \
                               GtkCustomMenuItem))
 #define GTK_CUSTOM_MENU_ITEM_CLASS(klass)                               \
@@ skipping 88 matching lines @@
     GtkCustomMenuItem* menu_item);
 
 // Calls |callback| with every button and button-label in the container.
 void gtk_custom_menu_item_foreach_button(GtkCustomMenuItem* menu_item,
                                          GtkCallback callback,
                                          gpointer callback_data);
 
 G_END_DECLS
 
 #endif  // CHROME_BROWSER_UI_GTK_GTK_CUSTOM_MENU_ITEM_H_