[webcrypto] Refactor to use WebCryptoKeyAlgorithm create* functions.

content/child/webcrypto/webcrypto_util.cc

 // 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 "content/child/webcrypto/webcrypto_util.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "content/child/webcrypto/status.h"
@@ skipping 187 matching lines @@
 bool CreateSecretKeyAlgorithm(const blink::WebCryptoAlgorithm& algorithm,
                               unsigned int keylen_bytes,
                               blink::WebCryptoKeyAlgorithm* key_algorithm) {
   switch (algorithm.id()) {
     case blink::WebCryptoAlgorithmIdHmac: {
       blink::WebCryptoAlgorithm hash = GetInnerHashAlgorithm(algorithm);
       if (hash.isNull())
         return false;
       if (keylen_bytes > UINT_MAX / 8)
         return false;
-      *key_algorithm = blink::WebCryptoKeyAlgorithm::adoptParamsAndCreate(
-          algorithm.id(),
-          new blink::WebCryptoHmacKeyAlgorithmParams(hash, keylen_bytes * 8));
+      *key_algorithm =
+          blink::WebCryptoKeyAlgorithm::createHmac(hash.id(), keylen_bytes * 8);
       return true;
     }
     case blink::WebCryptoAlgorithmIdAesKw:
     case blink::WebCryptoAlgorithmIdAesCbc:
     case blink::WebCryptoAlgorithmIdAesCtr:
     case blink::WebCryptoAlgorithmIdAesGcm:
-      *key_algorithm = blink::WebCryptoKeyAlgorithm::adoptParamsAndCreate(
-          algorithm.id(),
-          new blink::WebCryptoAesKeyAlgorithmParams(keylen_bytes * 8));
+      *key_algorithm = blink::WebCryptoKeyAlgorithm::createAes(
+          algorithm.id(), keylen_bytes * 8);
       return true;
     default:
       return false;
   }
 }
 
 }  // namespace webcrypto
 
 }  // namespace content