Oilpan: avoid invoking some no-op finalizers.

Source/core/css/MediaList.h

Index: Source/core/css/MediaList.h
diff --git a/Source/core/css/MediaList.h b/Source/core/css/MediaList.h
index 834689537d171185e3bc2c3a12a366574d9ac3aa..3c44ce9c1f9ee29b9dcb0cde6d1f1534d6485bc6 100644
--- a/Source/core/css/MediaList.h
+++ b/Source/core/css/MediaList.h
@@ -70,20 +70,20 @@ private:
     WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> > m_queries;
 };
 
-class MediaList : public RefCountedWillBeGarbageCollectedFinalized<MediaList>, public ScriptWrappable {
+class MediaList final : public RefCountedWillBeGarbageCollected<MediaList>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
+    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaList);
 public:
     static PassRefPtrWillBeRawPtr<MediaList> create(MediaQuerySet* mediaQueries, CSSStyleSheet* parentSheet)
     {
         return adoptRefWillBeNoop(new MediaList(mediaQueries, parentSheet));
     }
+
     static PassRefPtrWillBeRawPtr<MediaList> create(MediaQuerySet* mediaQueries, CSSRule* parentRule)
     {
         return adoptRefWillBeNoop(new MediaList(mediaQueries, parentRule));
     }
 
-    ~MediaList();
-
     unsigned length() const { return m_mediaQueries->queryVector().size(); }
     String item(unsigned index) const;
     void deleteMedium(const String& oldMedium, ExceptionState&);