Extract Chrome-specific code from NativeAppWindowViews

chrome/browser/ui/views/apps/shaped_app_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 "chrome/browser/ui/views/apps/shaped_app_window_targeter.h"
-
-#include "chrome/browser/ui/views/apps/native_app_window_views.h"
-#include "ui/gfx/path.h"
-
-ShapedAppWindowTargeter::ShapedAppWindowTargeter(
-    aura::Window* window,
-    NativeAppWindowViews* app_window)
-    : wm::MaskedWindowTargeter(window),
-      app_window_(app_window) {
-}
-
-ShapedAppWindowTargeter::~ShapedAppWindowTargeter() {
-}
-
-bool ShapedAppWindowTargeter::GetHitTestMask(aura::Window* window,
-                                             gfx::Path* mask) const {
-  SkRegion* shape = app_window_->shape();
-  return shape ? shape->getBoundaryPath(mask) : false;
-}