Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/core/events/EventListenerMap.h

Index: Source/core/events/EventListenerMap.h
diff --git a/Source/core/events/EventListenerMap.h b/Source/core/events/EventListenerMap.h
index 78c46dfaa6b8da895344487cfeaa9f453c668b3b..f0500754ffd7452e0221284a89651bc0e6b760c0 100644
--- a/Source/core/events/EventListenerMap.h
+++ b/Source/core/events/EventListenerMap.h
@@ -43,7 +43,7 @@ namespace blink {
 
 class EventTarget;
 
-typedef Vector<RegisteredEventListener, 1> EventListenerVector;
+typedef WillBeHeapVector<RegisteredEventListener, 1> EventListenerVector;
 
 class CORE_EXPORT EventListenerMap {
     WTF_MAKE_NONCOPYABLE(EventListenerMap);
@@ -55,7 +55,7 @@ public:
     bool containsCapturing(const AtomicString& eventType) const;
 
     void clear();
-    bool add(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
+    bool add(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener>, bool useCapture);
     bool remove(const AtomicString& eventType, EventListener*, bool useCapture, size_t& indexOfRemovedListener);
     EventListenerVector* find(const AtomicString& eventType);
     Vector<AtomicString> eventTypes() const;