Move most of the [Pass]RefPtr's of CSSPrimitiveValue to our transition types.

Source/core/css/CSSFontValue.cpp

Index: Source/core/css/CSSFontValue.cpp
diff --git a/Source/core/css/CSSFontValue.cpp b/Source/core/css/CSSFontValue.cpp
index 4134ba5ea84ad47ef0b861d849337dbe00619d48..522c7f81a539c7fd88de7b199f76eae9c054727f 100644
--- a/Source/core/css/CSSFontValue.cpp
+++ b/Source/core/css/CSSFontValue.cpp
@@ -76,6 +76,12 @@ bool CSSFontValue::equals(const CSSFontValue& other) const
 
 void CSSFontValue::traceAfterDispatch(Visitor* visitor)
 {
+
+    visitor->trace(style);
+    visitor->trace(variant);
+    visitor->trace(weight);
+    visitor->trace(size);
+    visitor->trace(lineHeight);
     visitor->trace(family);
     CSSValue::traceAfterDispatch(visitor);
 }