+// FIXME: oilpan: If the WebCore-qualified Oilpan transition types
+// used below map to CPP #defines, move the type names they expand to
+// into the WebCore namespace. When Oilpan is always enabled, this
+// block can be removed.
+namespace WebCore {
+using WTF::RawPtr;
+using WTF::RefPtr;
+using WTF::Vector;
+};
+