extensions: Use stl utilities from the base namespace

extensions/browser/content_hash_tree.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 "extensions/browser/content_hash_tree.h"
 
 #include <memory>
 
 #include "base/stl_util.h"
 #include "crypto/secure_hash.h"
@@ skipping 24 matching lines @@
     while (i != current->end()) {
       std::unique_ptr<crypto::SecureHash> hash(
           crypto::SecureHash::Create(crypto::SecureHash::SHA256));
       for (int j = 0; j < branch_factor && i != current->end(); j++) {
         DCHECK_EQ(i->size(), crypto::kSHA256Length);
         hash->Update(i->data(), i->size());
         ++i;
       }
       parent_nodes.push_back(std::string(crypto::kSHA256Length, 0));
       std::string* output = &(parent_nodes.back());
-      hash->Finish(string_as_array(output), output->size());
+      hash->Finish(base::string_as_array(output), output->size());
     }
     current_nodes.swap(parent_nodes);
     parent_nodes.clear();
     current = &current_nodes;
   }
   DCHECK_EQ(1u, current->size());
   return (*current)[0];
 }
 
 }  // namespace extensions