[refactor] Replace custom utility function with base's "vector_as_array()"

content/child/webcrypto/openssl/aes_cbc_openssl.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/numerics/safe_math.h"
+#include "base/stl_util.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/openssl/aes_key_openssl.h"
 #include "content/child/webcrypto/openssl/key_openssl.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/webcrypto_util.h"
 #include "crypto/scoped_openssl_types.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 namespace content {
 
@@ skipping 56 matching lines @@
                          cipher,
                          NULL,
                          &raw_key[0],
                          params->iv().data(),
                          cipher_operation)) {
     return Status::OperationError();
   }
 
   buffer->resize(output_max_len.ValueOrDie());
 
-  unsigned char* const buffer_data = Uint8VectorStart(buffer);
+  unsigned char* const buffer_data = vector_as_array(buffer);
 
   int output_len = 0;
   if (!EVP_CipherUpdate(context.get(),
                         buffer_data,
                         &output_len,
                         data.bytes(),
                         data.byte_length()))
     return Status::OperationError();
   int final_output_chunk_len = 0;
   if (!EVP_CipherFinal_ex(
@@ skipping 31 matching lines @@
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformAesCbcImplementation() {
   return new AesCbcImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content