Oilpan: Move WorkerClients to the managed heap and trace its supplements.

Source/core/workers/WorkerClients.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define WorkerClients_h
 
 #include "platform/Supplementable.h"
 #include "wtf/Forward.h"
 
 namespace WebCore {
 
 // This is created on the main thread, passed to the worker thread and
 // attached to WorkerGlobalScope when it is created.
 // This class can be used to provide "client" implementations to Workers.
-class WorkerClients : public Supplementable<WorkerClients> {
+class WorkerClients : public NoBaseWillBeGarbageCollectedFinalized<WorkerClients>, public Supplementable<WorkerClients> {
     WTF_MAKE_NONCOPYABLE(WorkerClients);
 public:
-    static PassOwnPtr<WorkerClients> create()
+    static PassOwnPtrWillBeRawPtr<WorkerClients> create()
     {
-        return adoptPtr(new WorkerClients());
+        return adoptPtrWillBeNoop(new WorkerClients());
     }
 
     virtual ~WorkerClients() { }
 
+    virtual void trace(Visitor* visitor) OVERRIDE
+    {
+        Supplementable<WorkerClients>::trace(visitor);
+    }
+
 private:
     WorkerClients() { }
 };
 
 } // namespace WebCore
 
 #endif // WorkerClients_h