Add [WillBeGarbageCollected] to Event.idl

Source/core/events/PageTransitionEvent.h

Index: Source/core/events/PageTransitionEvent.h
diff --git a/Source/core/events/PageTransitionEvent.h b/Source/core/events/PageTransitionEvent.h
index f249292a84b8d3a45aec6fc401eb52be2ae164f0..39ad3fcfa03716b26755cb7c81f405bb32fccbd3 100644
--- a/Source/core/events/PageTransitionEvent.h
+++ b/Source/core/events/PageTransitionEvent.h
@@ -38,17 +38,17 @@ struct PageTransitionEventInit : public EventInit {
 
 class PageTransitionEvent FINAL : public Event {
 public:
-    static PassRefPtr<PageTransitionEvent> create()
+    static PassRefPtrWillBeRawPtr<PageTransitionEvent> create()
     {
-        return adoptRef(new PageTransitionEvent);
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new PageTransitionEvent);
     }
-    static PassRefPtr<PageTransitionEvent> create(const AtomicString& type, bool persisted)
+    static PassRefPtrWillBeRawPtr<PageTransitionEvent> create(const AtomicString& type, bool persisted)
     {
-        return adoptRef(new PageTransitionEvent(type, persisted));
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new PageTransitionEvent(type, persisted));
     }
-    static PassRefPtr<PageTransitionEvent> create(const AtomicString& type, const PageTransitionEventInit& initializer)
+    static PassRefPtrWillBeRawPtr<PageTransitionEvent> create(const AtomicString& type, const PageTransitionEventInit& initializer)
     {
-        return adoptRef(new PageTransitionEvent(type, initializer));
+        return adoptRefCountedWillBeRefCountedGarbageCollected(new PageTransitionEvent(type, initializer));
     }
 
     virtual ~PageTransitionEvent();