[ServiceWorker] Convert ping-pong IPC into mojo interface ServiceWorkerEventDispatcher

content/browser/service_worker/service_worker_version.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 694 matching lines @@
   void OnGetClientsFinished(int request_id, ServiceWorkerClients* clients);
 
   // The timeout timer periodically calls OnTimeoutTimer, which stops the worker
   // if it is excessively idle or unresponsive to ping.
   void StartTimeoutTimer();
   void StopTimeoutTimer();
   void OnTimeoutTimer();
   void SetTimeoutTimerInterval(base::TimeDelta interval);
 
   // Called by PingController for ping protocol.
-  ServiceWorkerStatusCode PingWorker();
+  void PingWorker();
   void OnPingTimeout();
 
   // Stops the worker if it is idle (has no in-flight requests) or timed out
   // ping.
   void StopWorkerIfIdle();
 
   // RecordStartWorkerResult is added as a start callback by StartTimeoutTimer
   // and records metrics about startup.
   void RecordStartWorkerResult(ServiceWorkerMetrics::EventType purpose,
                                Status prestart_status,
@@ skipping 188 matching lines @@
 
   // At this point |this| can have been deleted, so don't do anything other
   // than returning.
 
   return true;
 }
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_