Oilpan: Switch RefCountedGarbageCollected to GarbageCollectedFinalized for Node.

Source/modules/webaudio/MediaElementAudioSourceNode.h

Index: Source/modules/webaudio/MediaElementAudioSourceNode.h
diff --git a/Source/modules/webaudio/MediaElementAudioSourceNode.h b/Source/modules/webaudio/MediaElementAudioSourceNode.h
index 3f69b5d7f811545a1654156a9cdbfde6706f0246..27d19b25a6672046a78c71155625df46fce48494 100644
--- a/Source/modules/webaudio/MediaElementAudioSourceNode.h
+++ b/Source/modules/webaudio/MediaElementAudioSourceNode.h
@@ -62,7 +62,10 @@ private:
     // As an audio source, we will never propagate silence.
     virtual bool propagatesSilence() const OVERRIDE { return false; }
 
-    RefPtr<HTMLMediaElement> m_mediaElement;
+    // FIXME: This is a temporary change in order to build successfully.
+    // This CL won't be landed before https://codereview.chromium.org/294053006/.
+    GC_PLUGIN_IGNORE("http://crbug.com/353083")
+    RefPtrWillBePersistent<HTMLMediaElement> m_mediaElement;
     Mutex m_processLock;
 
     unsigned m_sourceNumberOfChannels;