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

Source/core/workers/WorkerMessagingProxy.h

Index: Source/core/workers/WorkerMessagingProxy.h
diff --git a/Source/core/workers/WorkerMessagingProxy.h b/Source/core/workers/WorkerMessagingProxy.h
index 4fcdd73c7643026f77e3c00fc2cd444cbaa0af3d..6640c0826c0bcc595482754018372cedb0e7a14a 100644
--- a/Source/core/workers/WorkerMessagingProxy.h
+++ b/Source/core/workers/WorkerMessagingProxy.h
@@ -30,6 +30,7 @@
 #include "core/dom/ExecutionContext.h"
 #include "core/workers/WorkerGlobalScopeProxy.h"
 #include "core/workers/WorkerLoaderProxy.h"
+#include "heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassOwnPtr.h"
@@ -78,7 +79,7 @@ namespace WebCore {
         virtual void postTaskToLoader(PassOwnPtr<ExecutionContextTask>) OVERRIDE;
         virtual bool postTaskToWorkerGlobalScope(PassOwnPtr<ExecutionContextTask>) OVERRIDE;
 
-        void workerThreadCreated(PassRefPtr<DedicatedWorkerThread>);
+        void workerThreadCreated(PassRefPtrWillBeRawPtr<DedicatedWorkerThread>);
 
     protected:
         virtual ~WorkerMessagingProxy();
@@ -90,7 +91,7 @@ namespace WebCore {
         OwnPtr<WorkerObjectProxy> m_workerObjectProxy;
         Worker* m_workerObject;
         bool m_mayBeDestroyed;
-        RefPtr<DedicatedWorkerThread> m_workerThread;
+        RefPtrWillBePersistent<DedicatedWorkerThread> m_workerThread;
 
         unsigned m_unconfirmedMessageCount; // Unconfirmed messages from worker object to worker thread.
         bool m_workerThreadHadPendingActivity; // The latest confirmation from worker thread reported that it was still active.