Add [WillBeGarbageCollected] to Event.idl

Source/core/storage/StorageEvent.h

Index: Source/core/storage/StorageEvent.h
diff --git a/Source/core/storage/StorageEvent.h b/Source/core/storage/StorageEvent.h
index c3a5a9e43ad232f86e1750a23c4a555d8990a88f..321d343bb6745cff023f92a65cf831a0e6dce8c9 100644
--- a/Source/core/storage/StorageEvent.h
+++ b/Source/core/storage/StorageEvent.h
@@ -46,9 +46,9 @@ struct StorageEventInit : public EventInit {
 
 class StorageEvent FINAL : public Event {
 public:
-    static PassRefPtr<StorageEvent> create();
-    static PassRefPtr<StorageEvent> create(const AtomicString& type, const String& key, const String& oldValue, const String& newValue, const String& url, Storage* storageArea);
-    static PassRefPtr<StorageEvent> create(const AtomicString&, const StorageEventInit&);
+    static PassRefPtrWillBeRawPtr<StorageEvent> create();
+    static PassRefPtrWillBeRawPtr<StorageEvent> create(const AtomicString& type, const String& key, const String& oldValue, const String& newValue, const String& url, Storage* storageArea);
+    static PassRefPtrWillBeRawPtr<StorageEvent> create(const AtomicString&, const StorageEventInit&);
     virtual ~StorageEvent();
 
     const String& key() const { return m_key; }