Makes RootWindowController window creation in terms of common types

ash/shell.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_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 583 matching lines @@
   }
 
   void SetTouchHudProjectionEnabled(bool enabled);
 
   bool is_touch_hud_projection_enabled() const {
     return is_touch_hud_projection_enabled_;
   }
 
   KeyboardUI* keyboard_ui() { return keyboard_ui_.get(); }
 
+  // TODO(sky): remove this. This was needed by sysui, but as sysui is going
+  // away it should no longer be needed.
   bool in_mus() const { return in_mus_; }
 
 #if defined(OS_CHROMEOS)
   // Creates instance of FirstRunHelper. Caller is responsible for deleting
   // returned object.
   ash::FirstRunHelper* CreateFirstRunHelper();
 
   // Toggles cursor compositing on/off. Native cursor is disabled when cursor
   // compositing is enabled, and vice versa.
   void SetCursorCompositingEnabled(bool enabled);
@@ skipping 203 matching lines @@
   bool in_mus_ = false;
 
   std::unique_ptr<KeyboardUI> keyboard_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_