Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/system/user/tray_user_separator.h

 // Copyright 2013 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_SYSTEM_USER_TRAY_USER_SEPARATOR_H_
 #define ASH_SYSTEM_USER_TRAY_USER_SEPARATOR_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/macros.h"
@@ skipping 13 matching lines @@
 
  private:
   // Overridden from SystemTrayItem.
   views::View* CreateTrayView(user::LoginStatus status) override;
   views::View* CreateDefaultView(user::LoginStatus status) override;
   views::View* CreateDetailedView(user::LoginStatus status) override;
   void DestroyTrayView() override {}
   void DestroyDefaultView() override;
   void DestroyDetailedView() override {}
   void UpdateAfterLoginStatusChange(user::LoginStatus status) override {}
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) override {}
+  void UpdateAfterShelfAlignmentChange(wm::ShelfAlignment alignment) override {}
 
   // True if the separator gets shown.
   bool separator_shown_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayUserSeparator);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_USER_TRAY_USER_SEPARATOR_H_