[Launcher per display] Removed Shell::status_area_widget(), system_tray()

ash/shell.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_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 130 matching lines @@
 
   // Should never be called before |CreateInstance()|.
   static Shell* GetInstance();
 
   // Returns true if the ash shell has been instantiated.
   static bool HasInstance();
 
   static void DeleteInstance();
 
   // Returns the root window controller for the primary root window.
+  // TODO(oshima): move this to |RootWindowController|
   static internal::RootWindowController* GetPrimaryRootWindowController();
 
   // Returns all root window controllers.
+  // TODO(oshima): move this to |RootWindowController|
   static RootWindowControllerList GetAllRootWindowControllers();
 
   // Returns the primary RootWindow. The primary RootWindow is the one
   // that has a launcher.
   static aura::RootWindow* GetPrimaryRootWindow();
 
   // Returns the active RootWindow. The active RootWindow is the one that
   // contains the current active window as a decendant child. The active
   // RootWindow remains the same even when the active window becomes NULL,
   // until the another window who has a different root window becomes active.
@@ skipping 187 matching lines @@
   void CreateModalBackground(aura::Window* window);
 
   // Called when a modal window is removed. It will activate
   // another modal window if any, or remove modal screens
   // on all displays.
   void OnModalWindowRemoved(aura::Window* removed);
 
   // Returns WebNotificationTray on the primary root window.
   WebNotificationTray* GetWebNotificationTray();
 
-  // Convenience accessor for members of StatusAreaWidget.
-  // NOTE: status_area_widget() may return NULL during shutdown;
-  // tray_delegate() and system_tray() will crash if called after
-  // status_area_widget() has been destroyed; check status_area_widget()
-  // before calling these in destructors.
-  internal::StatusAreaWidget* status_area_widget();
-  SystemTray* system_tray();
+  // Does the primary display have status area?
+  bool HasPrimaryStatusArea();
+
+  // Returns the system tray on primary display.
+  SystemTray* GetPrimarySystemTray();
 
   // TODO(stevenjb): Rename to system_tray_delegate().
   SystemTrayDelegate* tray_delegate() {
     return system_tray_delegate_.get();
   }
 
   SystemTrayNotifier* system_tray_notifier() {
     return system_tray_notifier_.get();
   }
 
@@ skipping 165 matching lines @@
 
   // For testing only: simulate that a modal window is open
   bool simulate_modal_window_open_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_