html_viewer: Move webcrypto to a place where html_viewer can use it.

content/child/webcrypto/nss/sym_key_nss.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_WEBCRYPTO_NSS_SYM_KEY_NSS_H_
-#define CONTENT_CHILD_WEBCRYPTO_NSS_SYM_KEY_NSS_H_
-
-#include <pkcs11t.h>
-
-#include "third_party/WebKit/public/platform/WebCrypto.h"
-
-namespace content {
-
-namespace webcrypto {
-
-class CryptoData;
-class GenerateKeyResult;
-class Status;
-
-Status GenerateSecretKeyNss(const blink::WebCryptoKeyAlgorithm& algorithm,
-                            bool extractable,
-                            blink::WebCryptoKeyUsageMask usages,
-                            unsigned int keylen_bits,
-                            CK_MECHANISM_TYPE mechanism,
-                            GenerateKeyResult* result);
-
-Status ImportKeyRawNss(const CryptoData& key_data,
-                       const blink::WebCryptoKeyAlgorithm& algorithm,
-                       bool extractable,
-                       blink::WebCryptoKeyUsageMask usages,
-                       CK_MECHANISM_TYPE mechanism,
-                       blink::WebCryptoKey* key);
-
-}  // namespace webcrypto
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_WEBCRYPTO_NSS_SYM_KEY_NSS_H_