ash: Remove unnecessary WmShelf::SchedulePaint() method

ash/common/shelf/overflow_bubble.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_COMMON_SHELF_OVERFLOW_BUBBLE_H_
 #define ASH_COMMON_SHELF_OVERFLOW_BUBBLE_H_
 
 #include "base/macros.h"
 #include "ui/views/pointer_watcher.h"
 #include "ui/views/widget/widget_observer.h"
@@ skipping 41 matching lines @@
   void OnPointerEventObserved(const ui::PointerEvent& event,
                               const gfx::Point& location_in_screen,
                               views::Widget* target) override;
 
   // Overridden from views::WidgetObserver:
   void OnWidgetDestroying(views::Widget* widget) override;
 
   WmShelf* wm_shelf_;
   OverflowBubbleView* bubble_;  // Owned by views hierarchy.
   views::View* anchor_;         // Owned by ShelfView.
-  ShelfView* shelf_view_;       // Owned by |bubble_|.
+
+  // ShelfView containing the overflow items. Owned by |bubble_|.
+  ShelfView* shelf_view_;
 
   DISALLOW_COPY_AND_ASSIGN(OverflowBubble);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_OVERFLOW_BUBBLE_H_