Delete the GTK+ port of Chrome.

ui/base/gtk/gtk_windowing.cc

-// 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.
-
-#include "ui/base/gtk/gtk_windowing.h"
-
-#include <gdk/gdkx.h>
-
-#include "base/logging.h"
-#include "ui/base/x/x11_util.h"
-#include "ui/gfx/gtk_compat.h"
-
-namespace ui {
-
-void StackPopupWindow(GtkWidget* popup, GtkWidget* toplevel) {
-  DCHECK(GTK_IS_WINDOW(popup) && gtk_widget_is_toplevel(popup) &&
-         gtk_widget_get_realized(popup));
-  DCHECK(GTK_IS_WINDOW(toplevel) && gtk_widget_is_toplevel(toplevel) &&
-         gtk_widget_get_realized(toplevel));
-
-  // Stack the |popup| window directly above the |toplevel| window.
-  // The popup window is a direct child of the root window, so we need to
-  // find a similar ancestor for the toplevel window (which might have been
-  // reparented by a window manager).  We grab the server while we're doing
-  // this -- otherwise, we'll get an error if the window manager reparents the
-  // toplevel window right after we call GetHighestAncestorWindow().
-  gdk_x11_display_grab(gtk_widget_get_display(toplevel));
-  XID toplevel_window_base = ui::GetHighestAncestorWindow(
-      ui::GetX11WindowFromGtkWidget(toplevel),
-      ui::GetX11RootWindow());
-  if (toplevel_window_base) {
-    XID window_xid = ui::GetX11WindowFromGtkWidget(popup);
-    XID window_parent = ui::GetParentWindow(window_xid);
-    if (window_parent == ui::GetX11RootWindow()) {
-      ui::RestackWindow(window_xid, toplevel_window_base, true);
-    } else {
-      // The window manager shouldn't reparent override-redirect windows.
-      DLOG(ERROR) << "override-redirect window " << window_xid
-                  << "'s parent is " << window_parent
-                  << ", rather than root window "
-                  << ui::GetX11RootWindow();
-    }
-  }
-  gdk_x11_display_ungrab(gtk_widget_get_display(toplevel));
-}
-
-}  // namespace ui
-