Include Event.h in fewer header files

Source/modules/serviceworkers/ServiceWorker.cpp

 /*
  * 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "ServiceWorker.h"
 
 #include "bindings/v8/ExceptionState.h"
 #include "bindings/v8/ScriptPromiseResolverWithContext.h"
 #include "bindings/v8/ScriptState.h"
 #include "core/dom/MessagePort.h"
+#include "core/events/Event.h"
 #include "modules/EventTargetModules.h"
 #include "platform/NotImplemented.h"
 #include "public/platform/WebMessagePortChannel.h"
 #include "public/platform/WebServiceWorkerState.h"
 #include "public/platform/WebString.h"
 #include <v8.h>
 
 namespace WebCore {
 
 class ServiceWorker::ThenFunction FINAL : public ScriptFunction {
@@ skipping 183 matching lines @@
     , WebServiceWorkerProxy(this)
     , m_outerWorker(worker)
     , m_proxyState(Initial)
 {
     ScriptWrappable::init(this);
     ASSERT(m_outerWorker);
     m_outerWorker->setProxy(this);
 }
 
 } // namespace WebCore