Create ash media delegate earlier during ash shell initialization

ash/common/wm_shell.h

 // Copyright 2016 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_WM_SHELL_H_
 #define ASH_COMMON_WM_SHELL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 41 matching lines @@
 
 // Similar to ash::Shell. Eventually the two will be merged.
 class ASH_EXPORT WmShell {
  public:
   // This is necessary for a handful of places that is difficult to plumb
   // through context.
   static void Set(WmShell* instance);
   static WmShell* Get();
   static bool HasInstance() { return instance_ != nullptr; }
 
+  void Initialize();
+
   ShellDelegate* delegate() { return delegate_.get(); }
 
   BrightnessControlDelegate* brightness_control_delegate() {
     return brightness_control_delegate_.get();
   }
 
   FocusCycler* focus_cycler() { return focus_cycler_.get(); }
 
   KeyboardBrightnessControlDelegate* keyboard_brightness_control_delegate() {
     return keyboard_brightness_control_delegate_.get();
@@ skipping 150 matching lines @@
   virtual ~WmShell();
 
   base::ObserverList<ShellObserver>* shell_observers() {
     return &shell_observers_;
   }
 
   void SetKeyboardUI(std::unique_ptr<KeyboardUI> keyboard_ui);
 
   // Helpers to set (and initialize) or destroy various delegates.
   // TODO(msw|jamescook): Remove these once ShellDelegate, etc. are ported.
-  void SetMediaDelegate(std::unique_ptr<MediaDelegate> delegate);
   void SetSystemTrayDelegate(std::unique_ptr<SystemTrayDelegate> delegate);
   void DeleteSystemTrayDelegate();
 
   void DeleteWindowSelectorController();
 
   void CreateMaximizeModeController();
   void DeleteMaximizeModeController();
 
   void CreateMruWindowTracker();
   void DeleteMruWindowTracker();
@@ skipping 22 matching lines @@
   bool simulate_modal_window_open_for_testing_ = false;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<LogoutConfirmationController> logout_confirmation_controller_;
 #endif
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SHELL_H_