[oilpan] Move CSSSegmentedFontFace to the managed heap

Source/core/css/CSSFontSelector.h

Index: Source/core/css/CSSFontSelector.h
diff --git a/Source/core/css/CSSFontSelector.h b/Source/core/css/CSSFontSelector.h
index d482571eb1c9819879d1572255b74281b161f4a6..4288afe8bca4dde4bcd43ecf42f5473b3d9db96e 100644
--- a/Source/core/css/CSSFontSelector.h
+++ b/Source/core/css/CSSFontSelector.h
@@ -57,7 +57,7 @@ public:
     virtual unsigned version() const OVERRIDE { return m_version; }
 
     virtual PassRefPtr<FontData> getFontData(const FontDescription&, const AtomicString&);
-    CSSSegmentedFontFace* getFontFace(const FontDescription&, const AtomicString& family);
+    Result<CSSSegmentedFontFace> getFontFace(const FontDescription&, const AtomicString& family);
 
     void clearDocument();
 
@@ -85,7 +85,9 @@ private:
     Document* m_document;
     HashMap<String, OwnPtr<Vector<RefPtr<CSSFontFace> > >, WTF::FastAllocator, CaseFoldingHash> m_fontFaces;
     HashMap<String, OwnPtr<Vector<RefPtr<CSSFontFace> > >, WTF::FastAllocator, CaseFoldingHash> m_locallyInstalledFontFaces;
-    HashMap<String, OwnPtr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace> > >, WTF::FastAllocator, CaseFoldingHash> m_fonts;
+    // FIXME(oilpan): Implement a weak hashmap on the managed heap.
+    typedef HashMap<unsigned, Persistent<CSSSegmentedFontFace> > SegmentedFontFaceHashMap;
+    HashMap<String, OwnPtr<SegmentedFontFaceHashMap>, WTF::FastAllocator, CaseFoldingHash> m_fonts;
     HashSet<FontSelectorClient*> m_clients;
 
     Vector<CachedResourceHandle<CachedFont> > m_fontsToBeginLoading;