components: Cleanup class/struct fwd declarations

components/webcrypto/algorithm_dispatch.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 COMPONENTS_WEBCRYPTO_ALGORITHM_DISPATCH_H_
 #define COMPONENTS_WEBCRYPTO_ALGORITHM_DISPATCH_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 
 namespace webcrypto {
 
-class AlgorithmImplementation;
 class CryptoData;
 class GenerateKeyResult;
 class Status;
 
 // These functions provide an entry point for synchronous webcrypto operations.
 //
 // The inputs to these methods come from Blink, and hence the validations done
 // by Blink can be assumed:
 //
 //   * The algorithm parameters are consistent with the algorithm
@@ skipping 96 matching lines @@
 bool DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm,
                             blink::WebCryptoKeyType type,
                             bool extractable,
                             blink::WebCryptoKeyUsageMask usages,
                             const CryptoData& key_data,
                             blink::WebCryptoKey* key);
 
 }  // namespace webcrypto
 
 #endif  // COMPONENTS_WEBCRYPTO_ALGORITHM_DISPATCH_H_