Refactor AddScrollListItem() in system menu detailed views

ash/system/tray/tri_view.cc

 // 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.
 
 #include "ash/system/tray/tri_view.h"
 
 #include "ash/system/tray/size_range_layout.h"
 #include "base/logging.h"
 #include "ui/views/border.h"
 #include "ui/views/layout/box_layout.h"
@@ skipping 92 matching lines @@
 }
 
 void TriView::SetMaxSize(Container container, const gfx::Size& size) {
   GetLayoutManager(container)->SetMaxSize(size);
 }
 
 void TriView::AddView(Container container, views::View* view) {
   GetContainer(container)->AddChildView(view);
 }
 
+void TriView::RemoveView(Container container, views::View* view) {
+  GetContainer(container)->RemoveChildView(view);
+}
+
 void TriView::RemoveAllChildren(Container container, bool delete_children) {
   GetContainer(container)->RemoveAllChildViews(delete_children);
 }
 
 void TriView::SetInsets(const gfx::Insets& insets) {
   box_layout_->set_inside_border_insets(insets);
 }
 
 void TriView::SetContainerBorder(Container container,
                                  std::unique_ptr<views::Border> border) {
@@ skipping 47 matching lines @@
       return center_container_layout_manager_;
     case Container::END:
       return end_container_layout_manager_;
   }
   // Required for some compilers.
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace ash