Simplify ServiceWorkerContainer's access to its window.

Source/modules/serviceworkers/ServiceWorkerContainer.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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ServiceWorkerContainer_h
 #define ServiceWorkerContainer_h
 
 #include "bindings/v8/ScriptPromise.h"
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ContextLifecycleObserver.h"
-#include "core/frame/DOMWindowLifecycleObserver.h"
 #include "modules/serviceworkers/ServiceWorker.h"
 #include "public/platform/WebServiceWorkerProviderClient.h"
 #include "wtf/Forward.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 class WebServiceWorkerProvider;
 class WebServiceWorker;
 }
 
 namespace WebCore {
 
 class Dictionary;
 class ExecutionContext;
 class ServiceWorker;
 
 class ServiceWorkerContainer FINAL :
     public RefCounted<ServiceWorkerContainer>,
     public ScriptWrappable,
     public ContextLifecycleObserver,
-    public DOMWindowLifecycleObserver,
     public blink::WebServiceWorkerProviderClient {
 public:
     static PassRefPtr<ServiceWorkerContainer> create(ExecutionContext*);
     ~ServiceWorkerContainer();
 
     void detachClient();
 
     PassRefPtrWillBeRawPtr<ServiceWorker> waiting() { return m_waiting.get(); }
     PassRefPtrWillBeRawPtr<ServiceWorker> controller() { return m_controller.get(); }
     ScriptPromise ready(ScriptState*);
@@ skipping 13 matching lines @@
     explicit ServiceWorkerContainer(ExecutionContext*);
 
     blink::WebServiceWorkerProvider* m_provider;
     RefPtr<ServiceWorker> m_waiting;
     RefPtr<ServiceWorker> m_controller;
 };
 
 } // namespace WebCore
 
 #endif // ServiceWorkerContainer_h