[oilpan] Move CSSFontFace and CSSSegmentedFontFace to the managed heap

Source/core/css/CSSSegmentedFontFace.h

Index: Source/core/css/CSSSegmentedFontFace.h
diff --git a/Source/core/css/CSSSegmentedFontFace.h b/Source/core/css/CSSSegmentedFontFace.h
index 6507d1763228f16a75b04eb1a8e93f6df624c66b..88a775488c76a19a8a1ec3105fc02391f5e11232 100644
--- a/Source/core/css/CSSSegmentedFontFace.h
+++ b/Source/core/css/CSSSegmentedFontFace.h
@@ -26,6 +26,7 @@
 #ifndef CSSSegmentedFontFace_h
 #define CSSSegmentedFontFace_h
 
+#include "heap/Handle.h"
 #include <wtf/HashMap.h>
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
@@ -40,9 +41,10 @@ class FontData;
 class FontDescription;
 class SegmentedFontData;
 
-class CSSSegmentedFontFace : public RefCounted<CSSSegmentedFontFace> {
+class CSSSegmentedFontFace : public HeapAllocatedFinalized<CSSSegmentedFontFace> {
+    DECLARE_GC_TYPE_MARKER
 public:
-    static PassRefPtr<CSSSegmentedFontFace> create(CSSFontSelector* selector) { return adoptRef(new CSSSegmentedFontFace(selector)); }
+    static Result<CSSSegmentedFontFace> create(CSSFontSelector* selector) { return adopt(new CSSSegmentedFontFace(selector)); }
     ~CSSSegmentedFontFace();
 
     CSSFontSelector* fontSelector() const { return m_fontSelector; }
@@ -63,6 +65,8 @@ public:
     bool checkFont() const;
     void loadFont(const FontDescription&, PassRefPtr<LoadFontCallback> loadCallback);
 
+    void accept(Visitor*) const { }
+
 private:
     CSSSegmentedFontFace(CSSFontSelector*);