Move some more WM functionality down into ash.

ui/aura_shell/window_properties.h

Index: ui/aura_shell/window_properties.h
===================================================================
--- ui/aura_shell/window_properties.h	(revision 115655)
+++ ui/aura_shell/window_properties.h	(working copy)
@@ -1,25 +0,0 @@
-// Copyright (c) 2011 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.
-
-#ifndef UI_AURA_SHELL_WINDOW_PROPERTIES_H_
-#define UI_AURA_SHELL_WINDOW_PROPERTIES_H_
-#pragma once
-
-namespace aura_shell {
-namespace internal {
-
-// Shell-specific window property keys.
-
-// Alphabetical sort.
-
-// A property key for a value from ShadowType describing the drop shadow that
-// should be displayed under the window.  If unset, no shadow is displayed.
-extern const char kShadowTypeKey[];
-
-// Alphabetical sort.
-
-}  // namespace internal
-}  // namespace aura_shell
-
-#endif  // UI_AURA_SHELL_WINDOW_PROPERTIES_H_