cros: Remove supervised user methods from SystemTrayDelegate

ash/system/tray/hover_highlight_view.h

 // Copyright 2013 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_HOVER_HIGHLIGHT_VIEW_H_
 #define ASH_SYSTEM_TRAY_HOVER_HIGHLIGHT_VIEW_H_
 
 #include "ash/system/tray/actionable_view.h"
 #include "ash/system/tray/tray_popup_item_style.h"
 #include "base/macros.h"
@@ skipping 16 matching lines @@
  public:
   enum class AccessibilityState {
     // The default accessibility view.
     DEFAULT,
     // This view is a checked checkbox.
     CHECKED_CHECKBOX,
     // This view is an unchecked checkbox.
     UNCHECKED_CHECKBOX
   };
 
+  // If |listener| is null then no action is taken on click.
   explicit HoverHighlightView(ViewClickListener* listener);
   ~HoverHighlightView() override;
 
   // Convenience function for adding an icon and a label. This also sets the
   // accessible name. Primarily used for scrollable rows in detailed views.
   void AddIconAndLabel(const gfx::ImageSkia& image, const base::string16& text);
 
   // Convenience function for adding an icon, a main label, and a sub label.
   // This also sets the accessible name besed on the main label. Used for
   // scrollable rows in detailed views.
@@ skipping 70 matching lines @@
   TriView* tri_view_ = nullptr;
   bool expandable_ = false;
   AccessibilityState accessibility_state_ = AccessibilityState::DEFAULT;
 
   DISALLOW_COPY_AND_ASSIGN(HoverHighlightView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_HOVER_HIGHLIGHT_VIEW_H_