content: Cleanup class/struct forward declarations

content/child/service_worker/service_worker_network_provider.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_CHILD_SERVICE_WORKER_SERVICE_WORKER_NETWORK_PROVIDER_H_
 #define CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_NETWORK_PROVIDER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker.mojom.h"
 #include "content/common/service_worker/service_worker_types.h"
 
 namespace blink {
-class WebDataSource;
 class WebLocalFrame;
 }  // namespace blink
 
 namespace content {
 
 class ServiceWorkerProviderContext;
 struct RequestNavigationParams;
 
 // A unique provider_id is generated for each instance.
 // Instantiated prior to the main resource load being started and remains
@@ skipping 47 matching lines @@
  private:
   const int provider_id_;
   scoped_refptr<ServiceWorkerProviderContext> context_;
   mojom::ServiceWorkerDispatcherHostAssociatedPtr dispatcher_host_;
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerNetworkProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_NETWORK_PROVIDER_H_