Remove leak of objects between isolated worlds on custom events.

Source/core/dom/CustomEvent.h

Index: Source/core/dom/CustomEvent.h
diff --git a/Source/core/dom/CustomEvent.h b/Source/core/dom/CustomEvent.h
index 6afc0ae12a2e08192039934f61fca4e48a8d4e3a..3d3212bf33c4192b64e90f4d5d838905bd3bceb6 100644
--- a/Source/core/dom/CustomEvent.h
+++ b/Source/core/dom/CustomEvent.h
@@ -34,8 +34,6 @@ namespace WebCore {
 
 struct CustomEventInit : public EventInit {

[adamk, 2013/06/22 01:00:04]

This can probably just be

typedef EventInit CustomEventInit;

[jww, 2013/06/25 01:50:29]

Done.

     CustomEventInit();
-
-    ScriptValue detail;
 };
 
 class CustomEvent : public Event {
@@ -52,19 +50,17 @@ public:
         return adoptRef(new CustomEvent(type, initializer));
     }
 
-    void initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, const ScriptValue& detail);
+    void initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable);
     void initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<SerializedScriptValue>);
 
     virtual const AtomicString& interfaceName() const;
 
-    const ScriptValue& detail() const { return m_detail; }
     PassRefPtr<SerializedScriptValue> serializedScriptValue() { return m_serializedScriptValue; }
 
 private:
     CustomEvent();
     CustomEvent(const AtomicString& type, const CustomEventInit& initializer);
 
-    ScriptValue m_detail;
     RefPtr<SerializedScriptValue> m_serializedScriptValue;
 };