Refactor: remove SetDisplayWorkAreaInsets calls.

ash/common/system/web_notification/ash_popup_alignment_delegate.h

 // Copyright 2014 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_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_
 #define ASH_COMMON_SYSTEM_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_
 
 #include <stdint.h>
 
 #include "ash/ash_export.h"
@@ skipping 54 matching lines @@
 
   // Get the current alignment of the shelf.
   ShelfAlignment GetAlignment() const;
 
   // Utility function to get the display which should be care about.
   display::Display GetCurrentDisplay() const;
 
   // Compute the new work area.
   void UpdateWorkArea();
 
-  // Overridden from ShellObserver:
-  void OnDisplayWorkAreaInsetsChanged() override;
-
   // WmShelfObserver:
   void WillChangeVisibilityState(ShelfVisibilityState new_state) override;
   void OnAutoHideStateChanged(ShelfAutoHideState new_state) override;
 
   // Overridden from display::DisplayObserver:
   void OnDisplayAdded(const display::Display& new_display) override;
   void OnDisplayRemoved(const display::Display& old_display) override;
   void OnDisplayMetricsChanged(const display::Display& display,
                                uint32_t metrics) override;
 
   display::Screen* screen_;
   gfx::Rect work_area_;
   WmShelf* shelf_;
   int tray_bubble_height_;
 
   DISALLOW_COPY_AND_ASSIGN(AshPopupAlignmentDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_