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

chrome/browser/ui/gtk/gtk_util.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_UTIL_H_
 #define CHROME_BROWSER_UI_GTK_GTK_UTIL_H_
 #pragma once
 
 #include <gtk/gtk.h>
 #include <string>
@@ skipping 74 matching lines @@
 
 // As above, but a convenience method for configuring dialog size.
 // |width_id| and |height_id| are resource IDs for the size.  If either of these
 // are set to -1, the respective size will be set to the widget default.
 // |resizable| also controls whether the dialog will be resizable
 // (this info is also necessary for getting the width-setting code
 // right).
 void SetWindowSizeFromResources(GtkWindow* window,
                                 int width_id, int height_id, bool resizable);
 
-// Places |window| approximately over center of |parent|, it also moves window
-// to parent's desktop. Use this only for non-modal dialogs, such as the
-// options window and content settings window; otherwise you should be using
-// transient_for.
-void CenterOverWindow(GtkWindow* window, GtkWindow* parent);
-
 // Puts all browser windows in one window group; this will make any dialog
 // spawned app modal.
 void MakeAppModalWindowGroup();
 
 // Called after an app modal dialog that used MakeAppModalWindowGroup() was
 // dismissed. Returns each browser window to its own window group.
 void AppModalDismissedUngroupWindows();
 
 // Remove all children from this container.
 void RemoveAllChildren(GtkWidget* container);
@@ skipping 217 matching lines @@
 void ApplyMessageDialogQuirks(GtkWidget* dialog);
 
 // Performs Cut/Copy/Paste operation on the |window|.
 void DoCut(BrowserWindow* window);
 void DoCopy(BrowserWindow* window);
 void DoPaste(BrowserWindow* window);
 
 }  // namespace gtk_util
 
 #endif  // CHROME_BROWSER_UI_GTK_GTK_UTIL_H_