aura: Move Window::ContainsMouse() implementation into the test API.

ui/aura/test/window_test_api.cc

 // Copyright 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 "ui/aura/test/window_test_api.h"
 
 #include "ui/aura/window.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_tree_host.h"
 
 namespace aura {
 namespace test {
 
 WindowTestApi::WindowTestApi(Window* window) : window_(window) {
 }
 
 bool WindowTestApi::OwnsLayer() const {
   return window_->OwnsLayer();
 }
 
 bool WindowTestApi::ContainsMouse() const {
-  return window_->ContainsMouse();
+  if (!window_->IsVisible())
+    return false;
+  WindowTreeHost* host = window_->GetHost();
+  return host &&
+         window_->ContainsPointInRoot(
+             host->dispatcher()->GetLastMouseLocationInRoot());
 }
 
 }  // namespace test
 }  // namespace aura