[oilpan] Move CSSSegmentedFontFace to the managed heap

Source/core/css/CSSFontFace.cpp

Index: Source/core/css/CSSFontFace.cpp
diff --git a/Source/core/css/CSSFontFace.cpp b/Source/core/css/CSSFontFace.cpp
index f0e611432ee4eb38e6ec2029bc361538a9edd467..a3d3885cb0f379263b31802cb7f9360aa0dfd5f2 100644
--- a/Source/core/css/CSSFontFace.cpp
+++ b/Source/core/css/CSSFontFace.cpp
@@ -57,14 +57,14 @@ bool CSSFontFace::isValid() const
     return false;
 }
 
-void CSSFontFace::addedToSegmentedFontFace(CSSSegmentedFontFace* segmentedFontFace)
+void CSSFontFace::addedToSegmentedFontFace(Handle<CSSSegmentedFontFace> segmentedFontFace)
 {
-    m_segmentedFontFaces.add(segmentedFontFace);
+    m_segmentedFontFaces.add(segmentedFontFace.raw());
 }
 
-void CSSFontFace::removedFromSegmentedFontFace(CSSSegmentedFontFace* segmentedFontFace)
+void CSSFontFace::removedFromSegmentedFontFace(Handle<CSSSegmentedFontFace> segmentedFontFace)
 {
-    m_segmentedFontFaces.remove(segmentedFontFace);
+    m_segmentedFontFaces.remove(segmentedFontFace.raw());
 }
 
 void CSSFontFace::addSource(PassOwnPtr<CSSFontFaceSource> source)
@@ -87,6 +87,8 @@ void CSSFontFace::fontLoaded(CSSFontFaceSource* source)
     // Use one of the CSSSegmentedFontFaces' font selector. They all have
     // the same font selector, so it's wasteful to store it in the CSSFontFace.
     CSSFontSelector* fontSelector = (*m_segmentedFontFaces.begin())->fontSelector();
+    if (!fontSelector)
+        return;
     fontSelector->fontLoaded();
 
     if (RuntimeEnabledFeatures::fontLoadEventsEnabled() && m_loadState == Loading) {
@@ -109,6 +111,8 @@ PassRefPtr<SimpleFontData> CSSFontFace::getFontData(const FontDescription& fontD
 
     ASSERT(!m_segmentedFontFaces.isEmpty());
     CSSFontSelector* fontSelector = (*m_segmentedFontFaces.begin())->fontSelector();
+    if (!fontSelector)
+        return 0;
 
     if (RuntimeEnabledFeatures::fontLoadEventsEnabled() && m_loadState == NotLoaded)
         notifyFontLoader(Loading);
@@ -132,7 +136,10 @@ void CSSFontFace::notifyFontLoader(LoadState newState)
 {
     m_loadState = newState;
 
-    Document* document = (*m_segmentedFontFaces.begin())->fontSelector()->document();
+    CSSFontSelector* fontSelector = (*m_segmentedFontFaces.begin())->fontSelector();
+    if (!fontSelector)
+        return;
+    Document* document = fontSelector->document();
     if (!document)
         return;