Cleanup: rename usage_mask --> usages.

content/child/webcrypto/structured_clone.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_STRUCTURED_CLONE_H_
 #define CONTENT_CHILD_WEBCRYPTO_STRUCTURED_CLONE_H_
 
 #include <stdint.h>
 
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 
 namespace content {
 
 namespace webcrypto {
 
 class CryptoData;
 
 // Called on the target Blink thread.
 bool SerializeKeyForClone(const blink::WebCryptoKey& key,
                           blink::WebVector<uint8_t>* key_data);
 
 // Called on the target Blink thread.
 bool DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm,
                             blink::WebCryptoKeyType type,
                             bool extractable,
-                            blink::WebCryptoKeyUsageMask usage_mask,
+                            blink::WebCryptoKeyUsageMask usages,
                             const CryptoData& key_data,
                             blink::WebCryptoKey* key);
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_STRUCTURED_CLONE_H_