content: Cleanup class/struct forward declarations

content/renderer/fetchers/associated_resource_fetcher_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_FETCHERS_ASSOCIATED_RESOURCE_FETCHER_IMPL_H_
 #define CONTENT_RENDERER_FETCHERS_ASSOCIATED_RESOURCE_FETCHER_IMPL_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "content/public/renderer/associated_resource_fetcher.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/web/WebAssociatedURLLoaderOptions.h"
 
 class GURL;
 
 namespace blink {
 class WebAssociatedURLLoader;
 class WebFrame;
-class WebURLLoader;
 enum class WebCachePolicy;
 }
 
 namespace content {
 
 class AssociatedResourceFetcherImpl : public AssociatedResourceFetcher {
  public:
   // AssociatedResourceFetcher implementation:
   void SetSkipServiceWorker(
       blink::WebURLRequest::SkipServiceWorker skip_service_worker) override;
@@ skipping 27 matching lines @@
 
   // Limit how long to wait for the server.
   base::OneShotTimer timeout_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(AssociatedResourceFetcherImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_FETCHERS_ASSOCIATED_RESOURCE_FETCHER_IMPL_H_