Enable Oilpan by default for webaudio/

Source/modules/webaudio/MediaElementAudioSourceNode.cpp

Index: Source/modules/webaudio/MediaElementAudioSourceNode.cpp
diff --git a/Source/modules/webaudio/MediaElementAudioSourceNode.cpp b/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
index 320ff8c537cec1da7e4bee4d6cc7c3141f363a60..e95100d2f5903f9a0fe758714b2ad6c75b9ff63f 100644
--- a/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
+++ b/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
@@ -41,9 +41,9 @@ const unsigned maxSampleRate = 192000;
 
 namespace blink {
 
-PassRefPtrWillBeRawPtr<MediaElementAudioSourceNode> MediaElementAudioSourceNode::create(AudioContext* context, HTMLMediaElement* mediaElement)
+MediaElementAudioSourceNode* MediaElementAudioSourceNode::create(AudioContext* context, HTMLMediaElement* mediaElement)
 {
-    return adoptRefWillBeNoop(new MediaElementAudioSourceNode(context, mediaElement));
+    return adoptRefCountedGarbageCollectedWillBeNoop(new MediaElementAudioSourceNode(context, mediaElement));
 }
 
 MediaElementAudioSourceNode::MediaElementAudioSourceNode(AudioContext* context, HTMLMediaElement* mediaElement)
@@ -145,18 +145,12 @@ void MediaElementAudioSourceNode::process(size_t numberOfFrames)
 
 void MediaElementAudioSourceNode::lock()
 {
-#if !ENABLE(OILPAN)
-    ref();
-#endif
     m_processLock.lock();
 }
 
 void MediaElementAudioSourceNode::unlock()
 {
     m_processLock.unlock();
-#if !ENABLE(OILPAN)
-    deref();
-#endif
 }
 
 void MediaElementAudioSourceNode::trace(Visitor* visitor)