Revert of [ServiceWorker] Mojofy PushEvent of Service Worker.

content/common/service_worker/service_worker_event_dispatcher.mojom

 // Copyright 2016 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.
 
 module content.mojom;
 
 import "content/common/url_loader.mojom";
 import "mojo/common/string16.mojom";
 import "mojo/common/time.mojom";
 import "third_party/WebKit/public/platform/modules/background_sync/background_sync.mojom";
 import "third_party/WebKit/public/platform/modules/serviceworker/service_worker_event_status.mojom";
 import "url/mojo/origin.mojom";
 
 [Native]
-struct PushEventPayload;
-
-[Native]
 struct ServiceWorkerFetchRequest;
 
 [Native]
 struct ExtendableMessageEventSource;
 
 struct FetchEventPreloadHandle {
   URLLoader url_loader;
   URLLoaderClient& url_loader_client_request;
 };
 
 struct ExtendableMessageEvent {
   mojo.common.mojom.String16 message;
   url.mojom.Origin source_origin;
   array<int32> message_ports;
   array<int32> new_routing_ids;
   ExtendableMessageEventSource source;
 };
 
 // Renderer-side interface bound to ServiceWorkerContextClient for dispatching
 // events.
 interface ServiceWorkerEventDispatcher {
   // |fetch_event_id| is used internally when sending the response back to the
   // browser process.
   DispatchFetchEvent(int32 fetch_event_id, ServiceWorkerFetchRequest request,
                      FetchEventPreloadHandle? preload_handle)
       => (blink.mojom.ServiceWorkerEventStatus status,
           mojo.common.mojom.Time dispatch_event_time);
-  DispatchPushEvent(PushEventPayload payload)
-      => (blink.mojom.ServiceWorkerEventStatus status,
-          mojo.common.mojom.Time dispatch_event_time);
   // Arguments are passed to the event handler as parameters of SyncEvent.
   // Ref: https://wicg.github.io/BackgroundSync/spec/#sync-event
   DispatchSyncEvent(string tag,
                     blink.mojom.BackgroundSyncEventLastChance last_chance)
       => (blink.mojom.ServiceWorkerEventStatus status,
           mojo.common.mojom.Time dispatch_event_time);
   DispatchExtendableMessageEvent(ExtendableMessageEvent event)
       => (blink.mojom.ServiceWorkerEventStatus status,
           mojo.common.mojom.Time dispatch_event_time);
 };