Add [WillBeGarbageCollected] to Event.idl

Source/modules/serviceworkers/InstallEvent.cpp

Index: Source/modules/serviceworkers/InstallEvent.cpp
diff --git a/Source/modules/serviceworkers/InstallEvent.cpp b/Source/modules/serviceworkers/InstallEvent.cpp
index 5a476b84e87dc1b23a0eb458d01846da5917e26e..de60fb3ef831d5747bb9a2330db4ce6b52616a9a 100644
--- a/Source/modules/serviceworkers/InstallEvent.cpp
+++ b/Source/modules/serviceworkers/InstallEvent.cpp
@@ -39,14 +39,14 @@
 
 namespace WebCore {
 
-PassRefPtr<InstallEvent> InstallEvent::create()
+PassRefPtrWillBeRawPtr<InstallEvent> InstallEvent::create()
 {
-    return adoptRef(new InstallEvent());
+    return adoptRefCountedWillBeRefCountedGarbageCollected(new InstallEvent());
 }
 
-PassRefPtr<InstallEvent> InstallEvent::create(const AtomicString& type, const EventInit& initializer, PassRefPtr<WaitUntilObserver> observer)
+PassRefPtrWillBeRawPtr<InstallEvent> InstallEvent::create(const AtomicString& type, const EventInit& initializer, PassRefPtr<WaitUntilObserver> observer)
 {
-    return adoptRef(new InstallEvent(type, initializer, observer));
+    return adoptRefCountedWillBeRefCountedGarbageCollected(new InstallEvent(type, initializer, observer));
 }
 
 void InstallEvent::replace()