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

content/child/webcrypto/nss/aes_gcm_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 "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 "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
 
 // At the time of this writing:
 //   * Windows and Mac builds ship with their own copy of NSS (3.15+)
@@ skipping 89 matching lines @@
   // However NSS has a bug whereby it will fail if the output buffer size is
   // not at least as large as the ciphertext:
   //
   // https://bugzilla.mozilla.org/show_bug.cgi?id=%20853674
   //
   // From the analysis of that bug it looks like it might be safe to pass a
   // correctly sized buffer but lie about its size. Since resizing the
   // WebCryptoArrayBuffer is expensive that hack may be worth looking into.
 
   buffer->resize(buffer_size.ValueOrDie());
-  unsigned char* buffer_data = Uint8VectorStart(buffer);
+  unsigned char* buffer_data = vector_as_array(buffer);
 
   PK11_EncryptDecryptFunction encrypt_or_decrypt_func =
       (mode == ENCRYPT) ? NssRuntimeSupport::Get()->pk11_encrypt_func()
                         : NssRuntimeSupport::Get()->pk11_decrypt_func();
 
   unsigned int output_len = 0;
   SECStatus result = encrypt_or_decrypt_func(sym_key,
                                              CKM_AES_GCM,
                                              &param,
                                              buffer_data,
@@ skipping 52 matching lines @@
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformAesGcmImplementation() {
   return new AesGcmImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content