move KeyUsageAllows to more logical place(part2)

components/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 "components/webcrypto/webcrypto_util.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "components/webcrypto/status.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
@@ skipping 77 matching lines @@
     blink::WebCryptoNamedCurve named_curve) {
   return blink::WebCryptoAlgorithm::adoptParamsAndCreate(
       id, new blink::WebCryptoEcKeyImportParams(named_curve));
 }
 
 bool ContainsKeyUsages(blink::WebCryptoKeyUsageMask a,
                        blink::WebCryptoKeyUsageMask b) {
   return (a & b) == b;
 }
 
-// TODO(eroman): Move this helper to WebCryptoKey.
-bool KeyUsageAllows(const blink::WebCryptoKey& key,
-                    const blink::WebCryptoKeyUsage usage) {
-  return ((key.usages() & usage) != 0);
-}
-
 // The WebCrypto spec defines the default value for the tag length, as well as
 // the allowed values for tag length.
 Status GetAesGcmTagLengthInBits(const blink::WebCryptoAesGcmParams* params,
                                 unsigned int* tag_length_bits) {
   *tag_length_bits = 128;
   if (params->hasTagLengthBits())
     *tag_length_bits = params->optionalTagLengthBits();
 
   if (*tag_length_bits != 32 && *tag_length_bits != 64 &&
       *tag_length_bits != 96 && *tag_length_bits != 104 &&
@@ skipping 205 matching lines @@
   *public_usages = combined_usages & all_public_usages;
   *private_usages = combined_usages & all_private_usages;
 
   if (*private_usages == 0)
     return Status::ErrorCreateKeyEmptyUsages();
 
   return Status::Success();
 }
 
 }  // namespace webcrypto