Remove the system menu display settings row

ash/system/chromeos/screen_layout_observer.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_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
-#define ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
+#ifndef ASH_SYSTEM_CHROMEOS_SCREEN_LAYOUT_OBSERVER_H_
+#define ASH_SYSTEM_CHROMEOS_SCREEN_LAYOUT_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <map>
 
 #include "ash/ash_export.h"
-#include "ash/common/system/tray/system_tray_item.h"
 #include "ash/common/wm_display_observer.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "ui/display/manager/managed_display_info.h"
-#include "ui/views/view.h"
 
 namespace ash {
 
 class DisplayView;
 
-class ASH_EXPORT TrayDisplay : public SystemTrayItem, public WmDisplayObserver {
+// ScreenLayoutObserver is responsible to send notification to users when screen
+// resolution changes or screen rotation changes.
+class ASH_EXPORT ScreenLayoutObserver : public WmDisplayObserver {
  public:
-  explicit TrayDisplay(SystemTray* system_tray);
-  ~TrayDisplay() override;
+  ScreenLayoutObserver();
+  ~ScreenLayoutObserver() override;
 
   // Overridden from WmDisplayObserver:
   void OnDisplayConfigurationChanged() override;
 
  private:
-  friend class TrayDisplayTest;
+  friend class ScreenLayoutObserverTest;
 
   using DisplayInfoMap = std::map<int64_t, display::ManagedDisplayInfo>;
 
   static const char kNotificationId[];
 
   // Scans the current display info and updates |display_info_|. Sets the
   // previous data to |old_info| if it's not NULL.
   void UpdateDisplayInfo(DisplayInfoMap* old_info);
 
   // Compares the current display settings with |old_info| and determine what
   // message should be shown for notification. Returns true if there's a
   // meaningful change. Note that it's possible to return true and set
   // |message_out| to empty, which means the notification should be removed. It
   // also sets |additional_message_out| which appears in the notification with
   // the |message_out|.
   bool GetDisplayMessageForNotification(const DisplayInfoMap& old_info,
                                         base::string16* message_out,
                                         base::string16* additional_message_out);
 
   // Creates or updates the display notification.
   void CreateOrUpdateNotification(const base::string16& message,
                                   const base::string16& additional_message);
 
-  // Overridden from SystemTrayItem.
-  views::View* CreateDefaultView(LoginStatus status) override;
-  void DestroyDefaultView() override;
-
-  // Test accessors.
-  base::string16 GetDefaultViewMessage() const;
-  bool GetAccessibleStateForTesting(ui::AXViewState* state);
-  const views::View* default_view() const {
-    return reinterpret_cast<views::View*>(default_);
-  }
-
-  DisplayView* default_;
   DisplayInfoMap display_info_;
 
-  DISALLOW_COPY_AND_ASSIGN(TrayDisplay);
+  DISALLOW_COPY_AND_ASSIGN(ScreenLayoutObserver);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_CHROMEOS_TRAY_DISPLAY_H_
+#endif  // ASH_SYSTEM_CHROMEOS_SCREEN_LAYOUT_OBSERVER_H_