[Ash] Remove pre-MD code paths from HoverHighlightView

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 66 matching lines @@
   void ShowSettings();
 
   // Launches the a11y help article in a browser and closes the system menu.
   void ShowHelp();
 
   // Add the accessibility feature list.
   void AppendAccessibilityList();
 
   // Helper function to create entries in the detailed accessibility view.
   HoverHighlightView* AddScrollListItem(const base::string16& text,
-                                        bool highlight,
                                         bool checked,
                                         const gfx::VectorIcon& icon);
   HoverHighlightView* AddScrollListItemWithoutIcon(const base::string16& text,
                                                    bool checked);
 
   void AddSubHeader(const base::string16& header_text);
 
   views::View* spoken_feedback_view_ = nullptr;
   views::View* high_contrast_view_ = nullptr;
   views::View* screen_magnifier_view_ = nullptr;
@@ skipping 63 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_