ServiceWorker: Prevent premature garbage collection on ServiceWorkerRegistration

Source/modules/serviceworkers/ServiceWorkerRegistration.h

Index: Source/modules/serviceworkers/ServiceWorkerRegistration.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerRegistration.h b/Source/modules/serviceworkers/ServiceWorkerRegistration.h
index 12c6a466c5ee0c1edd167ef279dcc40edffb1c88..628179fa94a6750b8ade93f85296de2dd4cf8744 100644
--- a/Source/modules/serviceworkers/ServiceWorkerRegistration.h
+++ b/Source/modules/serviceworkers/ServiceWorkerRegistration.h
@@ -63,11 +63,17 @@ private:
     static PassRefPtrWillBeRawPtr<ServiceWorkerRegistration> getOrCreate(ExecutionContext*, PassOwnPtr<WebServiceWorkerRegistration>);
     ServiceWorkerRegistration(ExecutionContext*, PassOwnPtr<WebServiceWorkerRegistration>);
 
+    // ActiveDOMObject overrides.
+    virtual bool hasPendingActivity() const OVERRIDE;
+    virtual void stop() OVERRIDE;
+
     OwnPtr<WebServiceWorkerRegistration> m_outerRegistration;
     WebServiceWorkerProvider* m_provider;
     RefPtrWillBeMember<ServiceWorker> m_installing;
     RefPtrWillBeMember<ServiceWorker> m_waiting;
     RefPtrWillBeMember<ServiceWorker> m_active;
+
+    bool m_stopped;
 };
 
 } // namespace blink