Oilpan: add transition types to track interface objects.

Source/core/html/track/LoadableTextTrack.h

Index: Source/core/html/track/LoadableTextTrack.h
diff --git a/Source/core/html/track/LoadableTextTrack.h b/Source/core/html/track/LoadableTextTrack.h
index 944722019f6c84bd96971a815127bfbc579fc8b7..ac34d32ce67cafb56a47465db144b42c250c882b 100644
--- a/Source/core/html/track/LoadableTextTrack.h
+++ b/Source/core/html/track/LoadableTextTrack.h
@@ -28,6 +28,7 @@
 
 #include "core/html/track/TextTrack.h"
 #include "core/loader/TextTrackLoader.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
@@ -37,9 +38,9 @@ class LoadableTextTrack;
 
 class LoadableTextTrack FINAL : public TextTrack, private TextTrackLoaderClient {
 public:
-    static PassRefPtr<LoadableTextTrack> create(HTMLTrackElement* track)
+    static PassRefPtrWillBeRawPtr<LoadableTextTrack> create(HTMLTrackElement* track)
     {
-        return adoptRef(new LoadableTextTrack(track));
+        return adoptRefWillBeRefCountedGarbageCollected(new LoadableTextTrack(track));
     }
     virtual ~LoadableTextTrack();
 
@@ -55,6 +56,8 @@ public:
     virtual bool isDefault() const OVERRIDE { return m_isDefault; }
     virtual void setIsDefault(bool isDefault) OVERRIDE  { m_isDefault = isDefault; }
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     // TextTrackLoaderClient
     virtual void newCuesAvailable(TextTrackLoader*) OVERRIDE;
@@ -67,7 +70,7 @@ private:
 
     HTMLTrackElement* m_trackElement;
     Timer<LoadableTextTrack> m_loadTimer;
-    OwnPtr<TextTrackLoader> m_loader;
+    OwnPtrWillBeMember<TextTrackLoader> m_loader;
     KURL m_url;
     bool m_isDefault;
 };