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

chrome/browser/chromeos/policy/login_policy_test_base.cc

 // Copyright 2015 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/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 36 matching lines @@
 
   scoped_ptr<base::ListValue> managed_users_list(new base::ListValue);
   managed_users_list->AppendString("*");
 
   base::DictionaryValue root_dict;
   root_dict.Set(policyType, policy_type_dict.Pass());
   root_dict.Set("managed_users", managed_users_list.Pass());
   root_dict.SetString("policy_user", account);
   root_dict.SetInteger("current_key_index", 0);
 
-  std::string jsonPolicy;
+  std::string json_policy;
   base::JSONWriter::WriteWithOptions(
-      &root_dict, base::JSONWriter::OPTIONS_PRETTY_PRINT, &jsonPolicy);
-  return jsonPolicy;
+      root_dict, base::JSONWriter::OPTIONS_PRETTY_PRINT, &json_policy);
+  return json_policy;
 }
 
 }  // namespace
 
 const char LoginPolicyTestBase::kAccountPassword[] = "letmein";
 const char LoginPolicyTestBase::kAccountId[] = "user@example.com";
 
 LoginPolicyTestBase::LoginPolicyTestBase() {
   // TODO(nkostylev): Fix this test harness for webview. http://crbug.com/477402
   set_use_webview(false);
@@ skipping 88 matching lines @@
   const int bytes_written =
       base::WriteFile(PolicyFilePath(), policy.data(), policy.size());
   ASSERT_EQ(static_cast<int>(policy.size()), bytes_written);
 }
 
 base::FilePath LoginPolicyTestBase::PolicyFilePath() const {
   return temp_dir_.path().AppendASCII("policy.json");
 }
 
 }  // namespace policy