chromeos: Rename ash::WmShelf to Shelf

ash/system/lock_screen_action/lock_screen_action_tray.h

 // Copyright 2017 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_LOCK_SCREEN_ACTION_LOCK_SCREEN_ACTION_TRAY_H_
 #define ASH_SYSTEM_LOCK_SCREEN_ACTION_LOCK_SCREEN_ACTION_TRAY_H_
 
 #include "ash/ash_export.h"
 #include "ash/public/interfaces/tray_action.mojom.h"
 #include "ash/session/session_observer.h"
@@ skipping 19 matching lines @@
 //       or the action handler is being launched.
 // The tray item action is performed by sending a request to handle the tray
 // action to registered mojom::TrayActionClient.
 //
 // Currently, only one action is supported - new (lock screen) note. This class
 // thus uses the assets associated with new note action.
 class ASH_EXPORT LockScreenActionTray : public TrayBackgroundView,
                                         public SessionObserver,
                                         public TrayActionObserver {
  public:
-  explicit LockScreenActionTray(WmShelf* wm_shelf);
+  explicit LockScreenActionTray(Shelf* shelf);
   ~LockScreenActionTray() override;
 
   // TrayBackgroundView:
   void Initialize() override;
   bool PerformAction(const ui::Event& event) override;
   base::string16 GetAccessibleNameForTray() override;
   bool ShouldBlockShelfAutoHide() const;
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
   void ClickedOutsideBubble() override;
 
@@ skipping 22 matching lines @@
 
   ScopedObserver<SessionController, SessionObserver> session_observer_;
   ScopedObserver<TrayAction, TrayActionObserver> tray_action_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(LockScreenActionTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_LOCK_SCREEN_ACTION_LOCK_SCREEN_ACTION_TRAY_H_