[refactor] Misc post-NSS WebCrypto cleanups.

components/webcrypto/algorithms/aes_ctr.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 <openssl/aes.h>
 #include <openssl/evp.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/numerics/safe_math.h"
 #include "base/stl_util.h"
 #include "components/webcrypto/algorithms/aes.h"
 #include "components/webcrypto/algorithms/util_openssl.h"
 #include "components/webcrypto/crypto_data.h"
 #include "components/webcrypto/key.h"
 #include "components/webcrypto/status.h"
 #include "components/webcrypto/webcrypto_util.h"
 #include "crypto/openssl_util.h"
 #include "crypto/scoped_openssl_types.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 namespace webcrypto {
 
 namespace {
 
 const EVP_CIPHER* GetAESCipherByKeyLength(size_t key_length_bytes) {
-  // BoringSSL does not support 192-bit AES keys.
+  // 192-bit AES is intentionally unsupported (http://crbug.com/533699).
   switch (key_length_bytes) {
     case 16:
       return EVP_aes_128_ctr();
     case 32:
       return EVP_aes_256_ctr();
     default:
       return NULL;
   }
 }
 
@@ skipping 220 matching lines @@
   }
 };
 
 }  // namespace
 
 scoped_ptr<AlgorithmImplementation> CreateAesCtrImplementation() {
   return make_scoped_ptr(new AesCtrImplementation);
 }
 
 }  // namespace webcrypto