components: Cleanup class/struct fwd declarations

components/nacl/renderer/manifest_downloader.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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "components/nacl/renderer/ppb_nacl_private.h"
 #include "third_party/WebKit/public/web/WebAssociatedURLLoaderClient.h"
 
 namespace blink {
 class WebAssociatedURLLoader;
 struct WebURLError;
-class WebURLLoader;
 class WebURLResponse;
 }
 
 namespace nacl {
 
 // Downloads a NaCl manifest (.nmf) and returns the contents of the file to
 // caller through a callback.
 class ManifestDownloader : public blink::WebAssociatedURLLoaderClient {
  public:
   typedef base::Callback<void(PP_NaClError, const std::string&)> Callback;
@@ skipping 22 matching lines @@
 
   std::unique_ptr<blink::WebAssociatedURLLoader> url_loader_;
   bool is_installed_;
   Callback cb_;
   std::string buffer_;
   int status_code_;
   PP_NaClError pp_nacl_error_;
 };
 
 }  // namespace nacl