chromeos: Rename ash::WmShelf to Shelf

ash/system/lock_screen_action/lock_screen_action_tray.cc

 // 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.
 
 #include "ash/system/lock_screen_action/lock_screen_action_tray.h"
 
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "ash/session/session_controller.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shell.h"
@@ skipping 37 matching lines @@
   }
 
   const gfx::ImageSkia& GetImage() const { return icon_->GetImage(); }
 
  private:
   views::ImageView* icon_;
 
   DISALLOW_COPY_AND_ASSIGN(NewNoteActionView);
 };
 
-LockScreenActionTray::LockScreenActionTray(WmShelf* wm_shelf)
-    : TrayBackgroundView(wm_shelf),
+LockScreenActionTray::LockScreenActionTray(Shelf* shelf)
+    : TrayBackgroundView(shelf),
       session_observer_(this),
       tray_action_observer_(this) {
   SetInkDropMode(InkDropMode::ON);
   SetVisible(false);
   new_note_action_view_ = new NewNoteActionView();
   tray_container()->AddChildView(new_note_action_view_);
 }
 
 LockScreenActionTray::~LockScreenActionTray() {}
 
@@ skipping 57 matching lines @@
                                     mojom::TrayActionState::kLaunching);
 
   SetVisible(true);
 }
 
 const gfx::ImageSkia& LockScreenActionTray::GetImageForTesting() const {
   return new_note_action_view_->GetImage();
 }
 
 }  // namespace ash