Convert JsonWriter::Write to taking a const ref for the in-param

chrome/browser/policy/test/local_policy_test_server.cc

 // Copyright (c) 2013 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 "chrome/browser/policy/test/local_policy_test_server.h"
 
 #include <ctype.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 222 matching lines @@
     return false;
 
   arguments->SetString("config-file", config_file_.AsUTF8Unsafe());
   if (!policy_key_.empty())
     arguments->SetString("policy-key", policy_key_.AsUTF8Unsafe());
   if (server_data_dir_.IsValid()) {
     arguments->SetString("data-dir", server_data_dir_.path().AsUTF8Unsafe());
 
     if (!clients_.empty()) {
       std::string json;
-      base::JSONWriter::Write(&clients_, &json);
+      base::JSONWriter::Write(clients_, &json);
       base::FilePath client_state_file =
           server_data_dir_.path().Append(kClientStateFileName);
       if (base::WriteFile(client_state_file, json.c_str(), json.size()) !=
           static_cast<int>(json.size())) {
         return false;
       }
       arguments->SetString("client-state", client_state_file.AsUTF8Unsafe());
     }
   }
 
   return true;
 }
 
 std::string LocalPolicyTestServer::GetSelector(const std::string& type,
                                                const std::string& entity_id) {
   std::string selector = type;
   if (!entity_id.empty())
     selector = base::StringPrintf("%s/%s", type.c_str(), entity_id.c_str());
   std::replace_if(selector.begin(), selector.end(), IsUnsafeCharacter, '_');
   return selector;
 }
 
 }  // namespace policy