Remove remaining non-MD Ash accessibility UI code

ash/common/system/tray_accessibility.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_ACCESSIBILITY_H_
 #define ASH_COMMON_SYSTEM_TRAY_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include "ash/common/accessibility_delegate.h"
@@ skipping 57 matching lines @@
 
   // Launches the WebUI settings in a browser and closes the system menu.
   void ShowSettings();
 
   // Launches the a11y help article in a browser and closes the system menu.
   void ShowHelp();
 
   // Add the accessibility feature list.
   void AppendAccessibilityList();
 
-  // Add help entries. Only used for non-MD.
-  void AppendHelpEntries();
-
-  // Helper function to create entries in the detailed accessibility view. The
-  // |icon| parameter is used to create button icons for MD only.
+  // Helper function to create entries in the detailed accessibility view.
   HoverHighlightView* AddScrollListItem(const base::string16& text,
                                         bool highlight,
                                         bool checked,
                                         const gfx::VectorIcon& icon);
 
   views::View* spoken_feedback_view_;
   views::View* high_contrast_view_;
   views::View* screen_magnifier_view_;
   views::View* large_cursor_view_;
   views::CustomButton* help_view_;
@@ skipping 53 matching lines @@
   // A11y feature status on just entering the lock screen.
   bool show_a11y_menu_on_lock_screen_;
 
   friend class chromeos::TrayAccessibilityTest;
   DISALLOW_COPY_AND_ASSIGN(TrayAccessibility);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_ACCESSIBILITY_H_