Prepare SystemTray to support notifications

ash/system/bluetooth/tray_bluetooth.h

Index: ash/system/bluetooth/tray_bluetooth.h
diff --git a/ash/system/bluetooth/tray_bluetooth.h b/ash/system/bluetooth/tray_bluetooth.h
index ab9ca48aec8a0fb9c8ac0fd0be2c7491e767a4c7..73323b703b460da7afab00fab1aa7aa4f2542c5d 100644
--- a/ash/system/bluetooth/tray_bluetooth.h
+++ b/ash/system/bluetooth/tray_bluetooth.h
@@ -8,7 +8,6 @@
 
 #include "ash/system/bluetooth/bluetooth_observer.h"
 #include "ash/system/tray/system_tray_item.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace ash {
 namespace internal {
@@ -37,8 +36,8 @@ class TrayBluetooth : public SystemTrayItem,
   // Overridden from BluetoothObserver.
   virtual void OnBluetoothRefresh() OVERRIDE;
 
-  scoped_ptr<tray::BluetoothDefaultView> default_;
-  scoped_ptr<tray::BluetoothDetailedView> detailed_;
+  tray::BluetoothDefaultView* default_;
+  tray::BluetoothDetailedView* detailed_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBluetooth);
 };