crypto: Use stl utilities from the base namespace

crypto/sha2.cc

 // Copyright (c) 2012 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 "crypto/sha2.h"
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/stl_util.h"
 #include "crypto/secure_hash.h"
 
 namespace crypto {
 
 void SHA256HashString(const base::StringPiece& str, void* output, size_t len) {
   std::unique_ptr<SecureHash> ctx(SecureHash::Create(SecureHash::SHA256));
   ctx->Update(str.data(), str.length());
   ctx->Finish(output, len);
 }
 
 std::string SHA256HashString(const base::StringPiece& str) {
   std::string output(kSHA256Length, 0);
-  SHA256HashString(str, string_as_array(&output), output.size());
+  SHA256HashString(str, base::string_as_array(&output), output.size());
   return output;
 }
 
 }  // namespace crypto