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

content/child/webcrypto/nss/aes_cbc_nss.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 <cryptohi.h>
 
 #include "base/numerics/safe_math.h"
+#include "base/stl_util.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/nss/aes_key_nss.h"
 #include "content/child/webcrypto/nss/key_nss.h"
 #include "content/child/webcrypto/nss/util_nss.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/webcrypto_util.h"
 #include "crypto/scoped_nss_types.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 namespace content {
@@ skipping 47 matching lines @@
   // https://bugzilla.mozilla.com/show_bug.cgi?id=921687.
   if (operation == CKA_DECRYPT &&
       (data.byte_length() == 0 || (data.byte_length() % AES_BLOCK_SIZE != 0))) {
     return Status::OperationError();
   }
 
   // TODO(eroman): Refine the output buffer size. It can be computed exactly for
   //               encryption, and can be smaller for decryption.
   buffer->resize(output_max_len.ValueOrDie());
 
-  unsigned char* buffer_data = Uint8VectorStart(buffer);
+  unsigned char* buffer_data = vector_as_array(buffer);
 
   int output_len;
   if (SECSuccess != PK11_CipherOp(context.get(),
                                   buffer_data,
                                   &output_len,
                                   buffer->size(),
                                   data.bytes(),
                                   data.byte_length())) {
     return Status::OperationError();
   }
@@ skipping 32 matching lines @@
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformAesCbcImplementation() {
   return new AesCbcImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content