Implement all system menu title row buttons for Ash MD

ash/common/system/tray/tray_details_view.h

 // Copyright (c) 2012 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_TRAY_TRAY_DETAILS_VIEW_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/special_popup_row.h"
 #include "ash/common/system/tray/view_click_listener.h"
@@ skipping 58 matching lines @@
   // Overridden to handle clicks on subclass-specific views.
   virtual void HandleViewClicked(views::View* view);
 
   // Overridden to handle button presses on subclass-specific buttons.
   virtual void HandleButtonPressed(views::Button* sender,
                                    const ui::Event& event);
 
   // Creates and adds subclass-specific buttons to the title row.
   virtual void CreateExtraTitleRowButtons();
 
-  // Overridden to show WebUI settings for subclass-specific detailed views.
-  virtual void ShowSettings();
-
   // Transition to default view from details view. If |title_row_| has focus
   // before transition, the default view should focus on the owner of this
   // details view.
   void TransitionToDefaultView();
 
   SystemTrayItem* owner_;
   SpecialPopupRow* title_row_;
   FixedSizedScrollView* scroller_;
   views::View* scroll_content_;
   ScrollBorder* scroll_border_;  // Weak reference
 
   // The back button that appears in the material design title row. Not owned.
   views::Button* back_button_;
 
-  // The settings button that appears in the material design title row. Not
-  // owned.
-  views::Button* settings_button_;
-
   DISALLOW_COPY_AND_ASSIGN(TrayDetailsView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_