ash: Cleanup class/struct forward declarations

ash/common/system/chromeos/cast/tray_cast.h

 // Copyright 2015 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_COMMON_SYSTEM_CHROMEOS_CAST_TRAY_CAST_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_CAST_TRAY_CAST_H_
 
 #include "ash/common/cast_config_delegate.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/system/tray/system_tray_item.h"
 #include "base/macros.h"
 
 namespace ash {
 namespace tray {
 class CastTrayView;
-class CastSelectDefaultView;
 class CastDetailedView;
 class CastDuplexView;
 }  // namespace tray
 
 class ASH_EXPORT TrayCast : public SystemTrayItem,
                             public ShellObserver,
                             public CastConfigDelegate::Observer {
  public:
   explicit TrayCast(SystemTray* system_tray);
   ~TrayCast() override;
@@ skipping 47 matching lines @@
   tray::CastTrayView* tray_ = nullptr;
   tray::CastDuplexView* default_ = nullptr;
   tray::CastDetailedView* detailed_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(TrayCast);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_CAST_TRAY_CAST_H_