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

Source/web/WorkerPermissionClient.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 41 matching lines @@
     virtual ~WorkerPermissionClient();
 
     bool allowDatabase(const WebString& name, const WebString& displayName, unsigned long estimatedSize);
     bool allowFileSystem();
     void requestFileSystemAccess(const WebPermissionCallbacks&);
     bool allowIndexedDB(const WebString& name);
 
     static const char* supplementName();
     static WorkerPermissionClient* from(WebCore::ExecutionContext&);
 
-    virtual void trace(WebCore::Visitor*) OVERRIDE
-    {
-        // FIXME: Oilpan: Move WorkerClients to the managed heap before using this trace method.
-    }
+    virtual void trace(WebCore::Visitor*) OVERRIDE { }
 
 private:
     explicit WorkerPermissionClient(PassOwnPtr<WebWorkerPermissionClientProxy>);
 
     OwnPtr<WebWorkerPermissionClientProxy> m_proxy;
 };
 
 void providePermissionClientToWorker(WebCore::WorkerClients*, PassOwnPtr<WebWorkerPermissionClientProxy>);
 
 } // namespace blink
 
 #endif // WorkerPermissionClient_h