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

ui/aura/window.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 "ui/aura/window.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 1425 matching lines @@
   if (layer_name.empty())
     layer_name = "Unnamed Window";
 
   if (id_ != -1)
     layer_name += " " + base::IntToString(id_);
 
   layer()->set_name(layer_name);
 #endif
 }
 
-bool Window::ContainsMouse() {
-  bool contains_mouse = false;
-  if (IsVisible()) {
-    WindowTreeHost* host = GetHost();
-    contains_mouse = host &&
-        ContainsPointInRoot(host->dispatcher()->GetLastMouseLocationInRoot());
-  }
-  return contains_mouse;
-}
-
 const Window* Window::GetAncestorWithLayer(gfx::Vector2d* offset) const {
   for (const aura::Window* window = this; window; window = window->parent()) {
     if (window->layer())
       return window;
     if (offset)
       *offset += window->bounds().OffsetFromOrigin();
   }
   if (offset)
     *offset = gfx::Vector2d();
   return NULL;
 }
 
 }  // namespace aura