chromeos: Move SystemTrayDelegate::RequestShutdown to WmShell

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
index 680cca98115e0c7b070be845bda048ed178f12c9..99af2de87e5b71f1842c60ef9e9123f472c0836c 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -14,7 +14,6 @@
 #include "ash/common/session/session_state_observer.h"
 #include "ash/common/system/chromeos/supervised/custodian_info_tray_observer.h"
 #include "ash/common/system/tray/ime_info.h"
-#include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "base/callback_forward.h"
 #include "base/callback_list.h"
@@ -94,7 +93,6 @@ class SystemTrayDelegateChromeOS
   void ShowUserLogin() override;
   void SignOut() override;
   void RequestRestartForUpdate() override;
-  void RequestShutdown() override;
   void GetAvailableBluetoothDevices(ash::BluetoothDeviceList* list) override;
   void BluetoothStartDiscovering() override;
   void BluetoothStopDiscovering() override;
@@ -138,8 +136,6 @@ class SystemTrayDelegateChromeOS
   void UserChangedChildStatus(user_manager::User* user) override;
 
  private:
-  ash::SystemTray* GetPrimarySystemTray();
-
   ash::SystemTrayNotifier* GetSystemTrayNotifier();
 
   void SetProfile(Profile* profile);