aura: Make Window::HitTest() a private method.

ash/wm/workspace/multi_window_resize_controller.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 "ash/wm/workspace/multi_window_resize_controller.h"
 
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/coordinate_conversion.h"
@@ skipping 521 matching lines @@
 bool MultiWindowResizeController::IsOverWindow(
     aura::Window* window,
     const gfx::Point& location_in_screen,
     int component) const {
   if (!window->delegate())
     return false;
 
   gfx::Point window_loc(location_in_screen);
   aura::Window::ConvertPointToTarget(
       window->GetRootWindow(), window, &window_loc);
-  return window->HitTest(window_loc) &&
+  return window->ContainsPoint(window_loc) &&
       window->delegate()->GetNonClientComponent(window_loc) == component;
 }
 
 }  // namespace internal
 }  // namespace ash