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

content/child/webcrypto/platform_crypto.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_PLATFORM_CRYPTO_H_
-#define CONTENT_CHILD_WEBCRYPTO_PLATFORM_CRYPTO_H_
-
-#include <stdint.h>
-#include <vector>
-
-#include "base/memory/scoped_ptr.h"
-#include "third_party/WebKit/public/platform/WebCrypto.h"
-
-// The definitions for these methods lives in either nss/ or openssl/
-namespace content {
-
-namespace webcrypto {
-
-class AlgorithmImplementation;
-
-void PlatformInit();
-
-scoped_ptr<blink::WebCryptoDigestor> CreatePlatformDigestor(
-    blink::WebCryptoAlgorithmId algorithm);
-
-AlgorithmImplementation* CreatePlatformShaImplementation();
-AlgorithmImplementation* CreatePlatformAesCbcImplementation();
-AlgorithmImplementation* CreatePlatformAesCtrImplementation();
-AlgorithmImplementation* CreatePlatformAesGcmImplementation();
-AlgorithmImplementation* CreatePlatformAesKwImplementation();
-AlgorithmImplementation* CreatePlatformHmacImplementation();
-AlgorithmImplementation* CreatePlatformRsaOaepImplementation();
-AlgorithmImplementation* CreatePlatformRsaSsaImplementation();
-AlgorithmImplementation* CreatePlatformRsaPssImplementation();
-AlgorithmImplementation* CreatePlatformEcdsaImplementation();
-AlgorithmImplementation* CreatePlatformEcdhImplementation();
-AlgorithmImplementation* CreatePlatformHkdfImplementation();
-AlgorithmImplementation* CreatePlatformPbkdf2Implementation();
-
-}  // namespace webcrypto
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_WEBCRYPTO_PLATFORM_CRYPTO_H_