Oilpan: Move the EventListener hierarchy to Oilpan's heap

Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef HTMLMediaElementEncryptedMedia_h
 #define HTMLMediaElementEncryptedMedia_h
 
 #include "core/EventTypeNames.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/events/EventTarget.h"
@@ skipping 51 matching lines @@
 
 private:
     friend class SetMediaKeysHandler;
 
     HTMLMediaElementEncryptedMedia(HTMLMediaElement&);
     void generateKeyRequest(WebMediaPlayer*, const String& keySystem, PassRefPtr<DOMUint8Array> initData, ExceptionState&);
     void addKey(WebMediaPlayer*, const String& keySystem, PassRefPtr<DOMUint8Array> key, PassRefPtr<DOMUint8Array> initData, const String& sessionId, ExceptionState&);
     void cancelKeyRequest(WebMediaPlayer*, const String& keySystem, const String& sessionId, ExceptionState&);
 
     // EventTarget
-    bool setAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>);
+    bool setAttributeEventListener(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener>);
     EventListener* getAttributeEventListener(const AtomicString& eventType);
 
     // Currently we have both EME v0.1b and EME WD implemented in media element.
     // But we do not want to support both at the same time. The one used first
     // will be supported. Use |m_emeMode| to track this selection.
     // FIXME: Remove EmeMode once EME v0.1b support is removed. See crbug.com/249976.
     enum EmeMode { EmeModeNotSelected, EmeModePrefixed, EmeModeUnprefixed };
 
     // check (and set if necessary) the encrypted media extensions (EME) mode
     // (v0.1b or WD). Returns whether the mode is allowed and successfully set.
     bool setEmeMode(EmeMode);
 
     HTMLMediaElement& m_mediaElement;
     EmeMode m_emeMode;
 
     bool m_isWaitingForKey;
 
     PersistentWillBeMember<MediaKeys> m_mediaKeys;
 };
 
 } // namespace blink
 
 #endif