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

content/renderer/service_worker/service_worker_context_client.cc

Index: content/renderer/service_worker/service_worker_context_client.cc
diff --git a/content/renderer/service_worker/service_worker_context_client.cc b/content/renderer/service_worker/service_worker_context_client.cc
index 838a19b4e2ae3d161a2dc0d9e10c1fe307ab95fb..83fb82d6d3c5d01cc7f0f3793decb8889dc0f23d 100644
--- a/content/renderer/service_worker/service_worker_context_client.cc
+++ b/content/renderer/service_worker/service_worker_context_client.cc
@@ -419,7 +419,6 @@ void ServiceWorkerContextClient::OnMessageReceived(
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_DidSkipWaiting, OnDidSkipWaiting)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_DidClaimClients, OnDidClaimClients)
     IPC_MESSAGE_HANDLER(ServiceWorkerMsg_ClaimClientsError, OnClaimClientsError)
-    IPC_MESSAGE_HANDLER(ServiceWorkerMsg_Ping, OnPing);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   DCHECK(handled);
@@ -1263,8 +1262,8 @@ void ServiceWorkerContextClient::OnClaimClientsError(
   context_->claim_clients_callbacks.Remove(request_id);
 }
 
-void ServiceWorkerContextClient::OnPing() {
-  Send(new ServiceWorkerHostMsg_Pong(GetRoutingID()));
+void ServiceWorkerContextClient::Ping(const PingCallback& callback) {
+  callback.Run();
 }
 
 void ServiceWorkerContextClient::OnNavigationPreloadResponse(