Oilpan: add transition types to track interface objects.

Source/core/html/HTMLTrackElement.cpp

Index: Source/core/html/HTMLTrackElement.cpp
diff --git a/Source/core/html/HTMLTrackElement.cpp b/Source/core/html/HTMLTrackElement.cpp
index 7dfe53d4a82b68a0450f2c6d1616ec327a1e643d..2c3bb94eae08142d1b5addb7333304a1d853f896 100644
--- a/Source/core/html/HTMLTrackElement.cpp
+++ b/Source/core/html/HTMLTrackElement.cpp
@@ -60,8 +60,10 @@ inline HTMLTrackElement::HTMLTrackElement(Document& document)
 
 HTMLTrackElement::~HTMLTrackElement()
 {
+#if !ENABLE(OILPAN)
     if (m_track)
         m_track->clearTrackElement();
+#endif
 }
 
 PassRefPtr<HTMLTrackElement> HTMLTrackElement::create(Document& document)
@@ -272,4 +274,10 @@ HTMLMediaElement* HTMLTrackElement::mediaElement() const
     return 0;
 }
 
+void HTMLTrackElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_track);
+    HTMLElement::trace(visitor);
+}
+
 }