[oilpan] Move CSSFontFace and CSSSegmentedFontFace to the managed heap

Source/core/css/CSSFontSelector.cpp

Index: Source/core/css/CSSFontSelector.cpp
diff --git a/Source/core/css/CSSFontSelector.cpp b/Source/core/css/CSSFontSelector.cpp
index 8828f1d8863ead16c88051f5398f29cf4830c88e..58554534d3314c481e2be2a03b4c33c2c613e703 100644
--- a/Source/core/css/CSSFontSelector.cpp
+++ b/Source/core/css/CSSFontSelector.cpp
@@ -507,13 +507,13 @@ CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDe
     if (!familyFontFaces || familyFontFaces->isEmpty())
         return 0;
 
-    OwnPtr<HashMap<unsigned, RefPtr<CSSSegmentedFontFace> > >& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
+    OwnPtr<HashMap<unsigned, Persistent<CSSSegmentedFontFace> > >& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
     if (!segmentedFontFaceCache)
-        segmentedFontFaceCache = adoptPtr(new HashMap<unsigned, RefPtr<CSSSegmentedFontFace> >);
+        segmentedFontFaceCache = adoptPtr(new HashMap<unsigned, Persistent<CSSSegmentedFontFace> >);
 
     FontTraitsMask traitsMask = fontDescription.traitsMask();
 
-    RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, 0).iterator->value;
+    Persistent<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, nullptr).iterator->value;
     if (!face) {
         face = CSSSegmentedFontFace::create(this);
 
@@ -554,7 +554,7 @@ CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDe
         for (unsigned i = 0; i < numCandidates; ++i)
             face->appendFontFace(candidateFontFaces[i]);
     }
-    return face.get();
+    return face.raw();
 }
 
 void CSSFontSelector::clearDocument()