Refactors away method implementations in ui::EventTargeter

ui/wm/core/masked_window_targeter.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 "ui/wm/core/masked_window_targeter.h"
 
 #include "ui/aura/window.h"
+#include "ui/events/event.h"
 #include "ui/gfx/path.h"
 
 namespace wm {
 
 MaskedWindowTargeter::MaskedWindowTargeter(aura::Window* masked_window)
     : masked_window_(masked_window) {
 }
 
 MaskedWindowTargeter::~MaskedWindowTargeter() {}
 
 bool MaskedWindowTargeter::EventLocationInsideBounds(
-    ui::EventTarget* target,
+    aura::Window* window,
     const ui::LocatedEvent& event) const {
-  aura::Window* window = static_cast<aura::Window*>(target);
   if (window == masked_window_) {
     gfx::Path mask;
     if (!GetHitTestMask(window, &mask))
       return WindowTargeter::EventLocationInsideBounds(window, event);
 
     gfx::Size size = window->bounds().size();
     SkRegion clip_region;
     clip_region.setRect(0, 0, size.width(), size.height());
 
     gfx::Point point = event.location();
     if (window->parent())
       aura::Window::ConvertPointToTarget(window->parent(), window, &point);
 
     SkRegion mask_region;
     return mask_region.setPath(mask, clip_region) &&
            mask_region.contains(point.x(), point.y());
   }
 
   return WindowTargeter::EventLocationInsideBounds(window, event);
 }
 
 }  // namespace wm