[mus+ash] Removes WmWindow from RootWindowcontroller implementation

ash/wm/window_properties.h

 // 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.
 
 #ifndef ASH_WM_WINDOW_PROPERTIES_H_
 #define ASH_WM_WINDOW_PROPERTIES_H_
 
 #include "ash/ash_export.h"
 #include "ui/base/class_property.h"
 #include "ui/base/ui_base_types.h"
@@ skipping 22 matching lines @@
   // The window manager creates an aura::Window and a views::Widget to show
   // the non-client frame decorations. In this case the creation type is
   // FOR_CLIENT.
   FOR_CLIENT,
 };
 
 // Shell-specific window property keys; some keys are exported for use in tests.
 
 // Alphabetical sort.
 
+// If this is set to true, the hit region for children is slightly larger for
+// easier resizing.
+ASH_EXPORT extern const aura::WindowProperty<bool>* const
+    kChildrenUseExtendedHitRegion;
+
 // If this is set to true, the window stays in the same root window even if the
 // bounds outside of its root window is set.
 ASH_EXPORT extern const aura::WindowProperty<bool>* const kLockedToRootKey;
 
 // A property key which stores the bounds to restore a window to. These take
 // preference over the current bounds/state. This is used by e.g. the always
 // tablet mode window manager.
 ASH_EXPORT extern const aura::WindowProperty<gfx::Rect*>* const
     kRestoreBoundsOverrideKey;
 
@@ skipping 15 matching lines @@
 
 // A property key to store WindowState in the window. The window state
 // is owned by the window.
 extern const aura::WindowProperty<wm::WindowState*>* const kWindowStateKey;
 
 // Alphabetical sort.
 
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_PROPERTIES_H_