content: Cleanup class/struct forward declarations

content/renderer/service_worker/service_worker_context_client.h

 // Copyright 2014 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_RENDERER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_CLIENT_H_
 #define CONTENT_RENDERER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_CLIENT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 27 matching lines @@
 class TaskRunner;
 }
 
 namespace blink {
 class WebDataConsumerHandle;
 class WebDataSource;
 struct WebServiceWorkerClientQueryOptions;
 class WebServiceWorkerContextProxy;
 class WebServiceWorkerProvider;
 class WebServiceWorkerResponse;
-struct WebSyncRegistration;
 }
 
 namespace IPC {
 class Message;
 }
 
 namespace content {
 
 struct PlatformNotificationData;
 struct PushEventPayload;
 struct ServiceWorkerClientInfo;
 class ServiceWorkerProviderContext;
 class ServiceWorkerContextClient;
 class ThreadSafeSender;
-class WebServiceWorkerRegistrationImpl;
 class EmbeddedWorkerInstanceClientImpl;
 
 // This class provides access to/from an ServiceWorker's WorkerGlobalScope.
 // Unless otherwise noted, all methods are called on the worker thread.
 class ServiceWorkerContextClient
     : public blink::WebServiceWorkerContextClient {
  public:
   using SyncCallback =
       base::Callback<void(blink::mojom::ServiceWorkerEventStatus,
                           base::Time /* dispatch_event_time */)>;
@@ skipping 212 matching lines @@
   // Initialized on the worker thread in workerContextStarted and
   // destructed on the worker thread in willDestroyWorkerContext.
   std::unique_ptr<WorkerContextData> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerContextClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SERVICE_WORKER_SERVICE_WORKER_CONTEXT_CLIENT_H_