GTK: Remove most calls to widget->window and replace with accessor.

chrome/browser/ui/gtk/bubble/bubble_gtk.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_BUBBLE_BUBBLE_GTK_H_
 #define CHROME_BROWSER_UI_GTK_BUBBLE_BUBBLE_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 158 matching lines @@
   // Provides colors and stuff.
   GtkThemeService* theme_service_;
 
   // The accel group attached to |window_|, to handle closing with escape.
   GtkAccelGroup* accel_group_;
 
   // The window for which we're being shown (and to which |rect_| is relative).
   // Note that it's possible for |toplevel_window_| to be NULL if the
   // window is destroyed before this object is destroyed, so it's important
   // to check for that case.
-  GtkWindow* toplevel_window_;
+  GtkWidget* toplevel_window_;
 
   // The widget that we use to relatively position the popup window.
   GtkWidget* anchor_widget_;
 
   // Provides an offset from |anchor_widget_|'s origin for MoveWindow() to
   // use.
   gfx::Rect rect_;
 
   // The current shape of |window_| (used to test whether clicks fall in it or
   // not).
@@ skipping 17 matching lines @@
   bool closed_by_escape_;
 
   content::NotificationRegistrar registrar_;
 
   ui::GtkSignalRegistrar signals_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BUBBLE_BUBBLE_GTK_H_