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

Source/heap/Handle.h

Index: Source/heap/Handle.h
diff --git a/Source/heap/Handle.h b/Source/heap/Handle.h
index 12c7aae49800b781b0bb144a329f9b87441a95ca..9331ec193b101aa8fcf508f8c4707b734319fa9d 100644
--- a/Source/heap/Handle.h
+++ b/Source/heap/Handle.h
@@ -389,6 +389,17 @@ public:
     }
 };
 
+// TraceTrait to allow compilation of trace method bodies when oilpan is disabled.
+// This should never be called, but is needed to compile.
+template<typename T>
+class TraceTrait<RefPtr<T> > {
+public:
+    static void trace(Visitor*, void*)
+    {
+        ASSERT_NOT_REACHED();
+    }
+};
+
 // WeakMember is similar to Member in that it is used to point to other oilpan
 // heap allocated objects.
 // However instead of creating a strong pointer to the object, the WeakMember creates