Use a uniform opaque type to represent web contents modal dialogs

chrome/browser/ui/gtk/constrained_window_gtk.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/gtk/constrained_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
@@ skipping 101 matching lines @@
   // until this tab is refocused.
   if (gtk_util::IsWidgetAncestryVisible(focus_widget))
     gtk_widget_grab_focus(focus_widget);
   else
     ContainingView()->focus_store()->SetWidget(focus_widget);
 }
 
 void ConstrainedWindowGtk::PulseWebContentsModalDialog() {
 }
 
-gfx::NativeWindow ConstrainedWindowGtk::GetNativeWindow() {
+NativeWebContentsModalDialog ConstrainedWindowGtk::GetNativeDialog() {
   return GTK_WINDOW(gtk_widget_get_toplevel(widget()));
 }
 
 void ConstrainedWindowGtk::BackgroundColorChanged() {
   GdkColor background;
   if (delegate_->GetBackgroundColor(&background)) {
     gtk_widget_modify_base(border_.get(), GTK_STATE_NORMAL, &background);
     gtk_widget_modify_fg(border_.get(), GTK_STATE_NORMAL, &background);
     gtk_widget_modify_bg(border_.get(), GTK_STATE_NORMAL, &background);
   }
@@ skipping 20 matching lines @@
 }
 
 void ConstrainedWindowGtk::OnHierarchyChanged(GtkWidget* sender,
                                               GtkWidget* previous_toplevel) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (!gtk_widget_is_toplevel(gtk_widget_get_toplevel(widget())))
     return;
 
   FocusWebContentsModalDialog();
 }