mash: Replace int ShelfIDs with AppLaunchID strings.

ash/wm/window_properties.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/window_properties.h"
 
 #include "ash/wm/window_state.h"
 
 DECLARE_UI_CLASS_PROPERTY_TYPE(ash::wm::WindowState*);
 DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(ASH_EXPORT, ash::WidgetCreationType);
 
 namespace ash {
 
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kLockedToRootKey, false);
 
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::Rect, kRestoreBoundsOverrideKey, NULL);
 
 DEFINE_UI_CLASS_PROPERTY_KEY(ui::WindowShowState,
                              kRestoreShowStateOverrideKey,
                              ui::SHOW_STATE_DEFAULT);
 
-DEFINE_UI_CLASS_PROPERTY_KEY(ShelfID, kShelfIDKey, kInvalidShelfID);
-
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSnapChildrenToPixelBoundary, false);
 
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kUsesScreenCoordinatesKey, false);
 
 DEFINE_UI_CLASS_PROPERTY_KEY(WidgetCreationType,
                              kWidgetCreationTypeKey,
                              WidgetCreationType::INTERNAL);
 
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(ash::wm::WindowState, kWindowStateKey, NULL);
 
 }  // namespace ash