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

Source/core/frame/DeviceSensorEventController.h

Index: Source/core/frame/DeviceSensorEventController.h
diff --git a/Source/core/frame/DeviceSensorEventController.h b/Source/core/frame/DeviceSensorEventController.h
index 0b0950c32bb2f61af9bcdee5ec77cb82f23498e6..085f1e2a1c71b79e0d7aa6e248347f329eec47e9 100644
--- a/Source/core/frame/DeviceSensorEventController.h
+++ b/Source/core/frame/DeviceSensorEventController.h
@@ -44,10 +44,10 @@ protected:
     explicit DeviceSensorEventController(Document&);
     virtual ~DeviceSensorEventController();
 
-    void dispatchDeviceEvent(const PassRefPtr<Event>);
+    void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
 
     virtual bool hasLastData() = 0;
-    virtual PassRefPtr<Event> getLastEvent() = 0;
+    virtual PassRefPtrWillBeRawPtr<Event> getLastEvent() = 0;
     virtual void registerWithDispatcher() = 0;
     virtual void unregisterWithDispatcher() = 0;
     virtual bool isNullEvent(Event*) = 0;