Shutdown the status tray before the system tray delegate.

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 587 matching lines @@
   ~Shell() override;
 
   void Init(const ShellInitParams& init_params);
 
   // Initializes virtual keyboard controller.
   void InitKeyboard();
 
   // Initializes the root window so that it can host browser windows.
   void InitRootWindow(aura::Window* root_window);
 
+  // Hides the shelf view if any are visible.
+  void HideShelf();
+
   // ash::SystemModalContainerEventFilterDelegate overrides:
   bool CanWindowReceiveEvents(aura::Window* window) override;
 
   // Overridden from ui::EventTarget:
   bool CanAcceptEvent(const ui::Event& event) override;
   EventTarget* GetParentTarget() override;
   scoped_ptr<ui::EventTargetIterator> GetChildIterator() const override;
   ui::EventTargeter* GetEventTargeter() override;
 
   // Overridden from aura::client::ActivationChangeObserver:
@@ skipping 147 matching lines @@
   scoped_ptr<GPUSupport> gpu_support_;
 
   base::SequencedWorkerPool* blocking_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_