Add [WillBeGarbageCollected] to Event.idl

Source/modules/device_orientation/DeviceMotionEvent.h

Index: Source/modules/device_orientation/DeviceMotionEvent.h
diff --git a/Source/modules/device_orientation/DeviceMotionEvent.h b/Source/modules/device_orientation/DeviceMotionEvent.h
index ce19d5fb6403af6c04cac2b439e34a45fff75700..213cc6657d6e4e396eb17baeb923533494377b0d 100644
--- a/Source/modules/device_orientation/DeviceMotionEvent.h
+++ b/Source/modules/device_orientation/DeviceMotionEvent.h
@@ -38,13 +38,13 @@ class DeviceRotationRate;
 class DeviceMotionEvent FINAL : public Event {
 public:
     virtual ~DeviceMotionEvent();
-    static PassRefPtr<DeviceMotionEvent> create()
+    static PassRefPtrWillBeRawPtr<DeviceMotionEvent> create()
     {
-        return adoptRef(new DeviceMotionEvent);
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new DeviceMotionEvent);
     }
-    static PassRefPtr<DeviceMotionEvent> create(const AtomicString& eventType, DeviceMotionData* deviceMotionData)
+    static PassRefPtrWillBeRawPtr<DeviceMotionEvent> create(const AtomicString& eventType, DeviceMotionData* deviceMotionData)
     {
-        return adoptRef(new DeviceMotionEvent(eventType, deviceMotionData));
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new DeviceMotionEvent(eventType, deviceMotionData));
     }
 
     void initDeviceMotionEvent(const AtomicString& type, bool bubbles, bool cancelable, DeviceMotionData*);