Oilpan: move core/workers to oilpan's heap.

Source/core/workers/SharedWorker.h

Index: Source/core/workers/SharedWorker.h
diff --git a/Source/core/workers/SharedWorker.h b/Source/core/workers/SharedWorker.h
index b19fd41b33210b4bfc574ec30e82a5b8f9ba607a..fbe41a4b0a747556dee55156ef6bc81e705bcc20 100644
--- a/Source/core/workers/SharedWorker.h
+++ b/Source/core/workers/SharedWorker.h
@@ -41,7 +41,7 @@ class ExceptionState;
 
 class SharedWorker FINAL : public AbstractWorker, public ScriptWrappable, public Supplementable<SharedWorker> {
 public:
-    static PassRefPtr<SharedWorker> create(ExecutionContext*, const String& url, const String& name, ExceptionState&);
+    static PassRefPtrWillBeRawPtr<SharedWorker> create(ExecutionContext*, const String& url, const String& name, ExceptionState&);
     virtual ~SharedWorker();
 
     MessagePort* port() const { return m_port.get(); }
@@ -53,10 +53,12 @@ public:
     // Allows this SharedWorker + JS wrapper to be garbage collected.
     void unsetPreventGC();
 
+    void trace(Visitor*);
+
 private:
     explicit SharedWorker(ExecutionContext*);
 
-    RefPtr<MessagePort> m_port;
+    RefPtrWillBeMember<MessagePort> m_port;
 };
 
 } // namespace WebCore