Use template specialization to generate WindowProperty code

ash/wm/system_modal_container_layout_manager.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/system_modal_container_layout_manager.h"
 
 #include <cmath>
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 12 matching lines @@
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/events/event.h"
 #include "ui/gfx/screen.h"
 #include "ui/keyboard/keyboard_controller.h"
 #include "ui/views/background.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 #include "ui/wm/core/compound_event_filter.h"
 
-DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(ASH_EXPORT, bool);
-
 namespace ash {
 
 // If this is set to true, the window will get centered.
 DEFINE_WINDOW_PROPERTY_KEY(bool, kCenteredKey, false);
 
 // The center point of the window can diverge this much from the center point
 // of the container to be kept centered upon resizing operations.
 const int kCenterPixelDelta = 32;
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 242 matching lines @@
 bool SystemModalContainerLayoutManager::DialogIsCentered(
     const gfx::Rect& window_bounds) {
   gfx::Point window_center = window_bounds.CenterPoint();
   gfx::Point container_center = GetUsableDialogArea().CenterPoint();
   return
       std::abs(window_center.x() - container_center.x()) < kCenterPixelDelta &&
       std::abs(window_center.y() - container_center.y()) < kCenterPixelDelta;
 }
 
 }  // namespace ash