Change various helper classes to transition types to get CSSValue entirely onto the gc heap.

Source/core/css/FontFace.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 89 matching lines @@
 }
 
 PassRefPtr<FontFace> FontFace::create(ExecutionContext* context, const AtomicString& family, const String& source, const Dictionary& descriptors, ExceptionState& exceptionState)
 {
     RefPtrWillBeRawPtr<CSSValue> src = parseCSSValue(toDocument(context), source, CSSPropertySrc);
     if (!src || !src->isValueList()) {
         exceptionState.throwDOMException(SyntaxError, "The source provided ('" + source + "') could not be parsed as a value list.");
         return nullptr;
     }
 
-    RefPtr<FontFace> fontFace = adoptRef<FontFace>(new FontFace(src));
+    RefPtr<FontFace> fontFace = adoptRefWillBeRefCountedGarbageCollected<FontFace>(new FontFace(src));
     fontFace->setFamily(context, family, exceptionState);
     if (exceptionState.hadException())
         return nullptr;
 
     String value;
     if (descriptors.get("style", value)) {
         fontFace->setStyle(context, value, exceptionState);
         if (exceptionState.hadException())
             return nullptr;
     }
@@ skipping 32 matching lines @@
     const StylePropertySet& properties = fontFaceRule->properties();
 
     // Obtain the font-family property and the src property. Both must be defined.
     RefPtrWillBeRawPtr<CSSValue> family = properties.getPropertyCSSValue(CSSPropertyFontFamily);
     if (!family || !family->isValueList())
         return nullptr;
     RefPtrWillBeRawPtr<CSSValue> src = properties.getPropertyCSSValue(CSSPropertySrc);
     if (!src || !src->isValueList())
         return nullptr;
 
-    RefPtr<FontFace> fontFace = adoptRef<FontFace>(new FontFace(src));
+    RefPtr<FontFace> fontFace = adoptRefWillBeRefCountedGarbageCollected<FontFace>(new FontFace(src));
 
     if (fontFace->setFamilyValue(toCSSValueList(family.get()))
         && fontFace->setPropertyFromStyle(properties, CSSPropertyFontStyle)
         && fontFace->setPropertyFromStyle(properties, CSSPropertyFontWeight)
         && fontFace->setPropertyFromStyle(properties, CSSPropertyFontStretch)
         && fontFace->setPropertyFromStyle(properties, CSSPropertyUnicodeRange)
         && fontFace->setPropertyFromStyle(properties, CSSPropertyFontVariant)
         && fontFace->setPropertyFromStyle(properties, CSSPropertyWebkitFontFeatureSettings)
         && !fontFace->family().isEmpty()
         && fontFace->traitsMask()) {
@@ skipping 272 matching lines @@
             traitsMask |= FontWeight100Mask;
             break;
         default:
             ASSERT_NOT_REACHED();
             break;
         }
     } else {
         traitsMask |= FontWeight400Mask;
     }
 
-    if (RefPtr<CSSValue> fontVariant = m_variant) {
+    if (RefPtrWillBeRawPtr<CSSValue> fontVariant = m_variant) {
         // font-variant descriptor can be a value list.
         if (fontVariant->isPrimitiveValue()) {
             RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createCommaSeparated();
             list->append(fontVariant);
             fontVariant = list;
         } else if (!fontVariant->isValueList()) {
             return 0;
         }
 
         CSSValueList* variantList = toCSSValueList(fontVariant.get());
@@ skipping 65 matching lines @@
 
         if (source) {
 #if ENABLE(SVG_FONTS)
             source->setSVGFontFaceElement(item->svgFontFaceElement());
 #endif
             m_cssFontFace->addSource(source.release());
         }
     }
 }
 
+void FontFace::trace(Visitor* visitor)
+{
+    visitor->trace(m_src);
+    visitor->trace(m_style);
+    visitor->trace(m_weight);
+    visitor->trace(m_stretch);
+    visitor->trace(m_unicodeRange);
+    visitor->trace(m_variant);
+    visitor->trace(m_featureSettings);
+}
+
 } // namespace WebCore