MacViews: Get c/b/ui/views/tabs to build on Mac

chrome/browser/ui/views/tabs/window_finder_x11.cc

 // Copyright 2014 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/views/tabs/window_finder.h"
 
 #include "ui/views/widget/desktop_aura/x11_topmost_window_finder.h"
 
 #if defined(USE_ASH)
-aura::Window* GetLocalProcessWindowAtPointAsh(
+gfx::NativeWindow GetLocalProcessWindowAtPointAsh(
     const gfx::Point& screen_point,
-    const std::set<aura::Window*>& ignore);
+    const std::set<gfx::NativeWindow>& ignore);
 #endif
 
-aura::Window* GetLocalProcessWindowAtPoint(
+gfx::NativeWindow GetLocalProcessWindowAtPoint(
     chrome::HostDesktopType host_desktop_type,
     const gfx::Point& screen_point,
-    const std::set<aura::Window*>& ignore) {
+    const std::set<gfx::NativeWindow>& ignore) {
 #if defined(USE_ASH)
   if (host_desktop_type == chrome::HOST_DESKTOP_TYPE_ASH)
     return GetLocalProcessWindowAtPointAsh(screen_point, ignore);
 #endif
 
   // The X11 server is the canonical state of what the window stacking order
   // is.
   views::X11TopmostWindowFinder finder;
   return finder.FindLocalProcessWindowAt(screen_point, ignore);
 }