Always enable Oilpan for EventSource.

Source/core/loader/WorkerLoaderClientBridgeSyncHelper.h

 /*
  * Copyright (C) 2014 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 29 matching lines @@
 namespace blink {
 class WebWaitableEvent;
 }
 
 namespace blink {
 
 // This bridge is created and destroyed on the worker thread, but is
 // passed to and used on the main thread. Each did* method records the given
 // data so that they can be run on the worker thread later (by run()).
 class WorkerLoaderClientBridgeSyncHelper : public ThreadableLoaderClient {
+    WTF_MAKE_FAST_ALLOCATED(WorkerLoaderClientBridgeSyncHelper);
 public:
     static PassOwnPtr<WorkerLoaderClientBridgeSyncHelper> create(ThreadableLoaderClientWrapper*, PassOwnPtr<WebWaitableEvent>);
     virtual ~WorkerLoaderClientBridgeSyncHelper();
 
     // Called on the worker context thread.
     void run();
 
     // Called on the main thread.
     virtual void didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent) override;
     virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&, PassOwnPtr<WebDataConsumerHandle>) override;
@@ skipping 13 matching lines @@
     RefPtr<ThreadableLoaderClientWrapper> m_client;
     OwnPtr<WebWaitableEvent> m_event;
     Vector<Vector<char>*> m_receivedData;
     Vector<OwnPtr<Closure>> m_clientTasks;
     Mutex m_lock;
 };
 
 } // namespace blink
 
 #endif // WorkerLoaderClientBridgeSyncHelper_h