Revert of [ServiceWorker] Mojofy PushEvent of Service Worker.

content/renderer/service_worker/service_worker_context_client.h

Index: content/renderer/service_worker/service_worker_context_client.h
diff --git a/content/renderer/service_worker/service_worker_context_client.h b/content/renderer/service_worker/service_worker_context_client.h
index 79410a6597266554a619419f4676d0a0ae74c46f..2686e316ac8aed153985e388c6c2c446880e96ed 100644
--- a/content/renderer/service_worker/service_worker_context_client.h
+++ b/content/renderer/service_worker/service_worker_context_client.h
@@ -220,8 +220,6 @@
                           const ServiceWorkerFetchRequest& request,
                           mojom::FetchEventPreloadHandlePtr preload_handle,
                           const DispatchFetchEventCallback& callback) override;
-  void DispatchPushEvent(const PushEventPayload& payload,
-                         const DispatchPushEventCallback& callback) override;
   void DispatchSyncEvent(
       const std::string& tag,
       blink::mojom::BackgroundSyncEventLastChance last_chance,
@@ -235,6 +233,7 @@
       const PlatformNotificationData& notification_data,
       int action_index,
       const base::NullableString16& reply);
+  void OnPushEvent(int request_id, const PushEventPayload& payload);
   void OnNotificationCloseEvent(
       int request_id,
       const std::string& notification_id,