Refactor AddScrollListItem() in system menu detailed views

ash/system/tray/tri_view.h

 // Copyright 2016 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_TRAY_TRI_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRI_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 67 matching lines @@
 
   // Get the minimum size for the given |container|.
   gfx::Size GetMinSize(Container container);
 
   // Set the maximum size for the given |container|.
   void SetMaxSize(Container container, const gfx::Size& size);
 
   // Adds the child |view| to the specified |container|.
   void AddView(Container container, views::View* view);
 
+  // Remove the child |view| from the specified |container|.
+  void RemoveView(Container container, views::View* view);
+
   // Removes all the children from the specified |container|. If
   // |delete_children| is true, the views are deleted, unless marked as not
   // parent owned.
   void RemoveAllChildren(Container container, bool delete_children);
 
   // During layout the |insets| are applied to the host views entire space
   // before allocating the remaining space to the container views.
   void SetInsets(const gfx::Insets& insets);
 
   // Sets the border for the given |container|.
@@ skipping 50 matching lines @@
   // to manipulate the child views during construction/destruction so this flag
   // is used to disable the DCHECK during construction/destruction.
   bool enable_hierarchy_changed_dcheck_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(TriView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRI_VIEW_H_