Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/modules/battery/BatteryManager.h

 // Copyright 2014 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 BatteryManager_h
 #define BatteryManager_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/Document.h"
 #include "core/events/EventTarget.h"
@@ skipping 17 matching lines @@
     bool charging();
     double chargingTime();
     double dischargingTime();
     double level();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(chargingchange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(chargingtimechange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(dischargingtimechange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(levelchange);
 
-    void didChangeBatteryStatus(PassRefPtr<Event>, PassOwnPtr<BatteryStatus>);
+    void didChangeBatteryStatus(PassRefPtrWillBeRawPtr<Event>, PassOwnPtr<BatteryStatus>);
 
     void trace(Visitor*) { }
 
 private:
     explicit BatteryManager(ExecutionContext*);
 
     OwnPtr<BatteryStatus> m_batteryStatus;
 };
 
 }
 
 #endif // BatteryManager_h