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

content/child/webcrypto/nss/sha_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 <sechash.h>
 #include <vector>
 
+#include "base/stl_util.h"
 #include "content/child/webcrypto/algorithm_implementation.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/nss/util_nss.h"
 #include "content/child/webcrypto/status.h"
 #include "content/child/webcrypto/webcrypto_util.h"
 #include "crypto/nss_util.h"
 #include "crypto/scoped_nss_types.h"
 
 namespace content {
 
@@ skipping 60 matching lines @@
     result_data = result_;
     return true;
   }
 
   Status FinishWithVectorAndStatus(std::vector<uint8_t>* result) {
     if (!hash_context_)
       return Status::ErrorUnexpected();
 
     unsigned int result_length = HASH_ResultLenContext(hash_context_);
     result->resize(result_length);
-    unsigned char* digest = Uint8VectorStart(result);
+    unsigned char* digest = vector_as_array(result);
     unsigned int digest_size;  // ignored
     return FinishInternal(digest, &digest_size);
   }
 
  private:
   Status Init() {
     HASH_HashType hash_type = WebCryptoAlgorithmToNSSHashType(algorithm_id_);
 
     if (hash_type == HASH_AlgNULL)
       return Status::ErrorUnsupported();
@@ skipping 51 matching lines @@
 }
 
 scoped_ptr<blink::WebCryptoDigestor> CreatePlatformDigestor(
     blink::WebCryptoAlgorithmId algorithm) {
   return scoped_ptr<blink::WebCryptoDigestor>(new DigestorNSS(algorithm));
 }
 
 }  // namespace webcrypto
 
 }  // namespace content