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

chrome/browser/ui/webui/signin/profile_signin_confirmation_dialog.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/ui/webui/signin/profile_signin_confirmation_dialog.h"
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/values.h"
@@ skipping 155 matching lines @@
 }
 
 std::string ProfileSigninConfirmationDialog::GetDialogArgs() const {
   std::string data;
   base::DictionaryValue dict;
   dict.SetString("username", username_);
   dict.SetBoolean("promptForNewProfile", prompt_for_new_profile_);
 #if defined(OS_WIN)
   dict.SetBoolean("hideTitle", true);
 #endif
-  base::JSONWriter::Write(&dict, &data);
+  base::JSONWriter::Write(dict, &data);
   return data;
 }
 
 void ProfileSigninConfirmationDialog::OnDialogClosed(
     const std::string& json_retval) {
   if (!closed_by_handler_)
     signin_delegate_->OnCancelSignin();
 }
 
 void ProfileSigninConfirmationDialog::OnCloseContents(
     content::WebContents* source,
     bool* out_close_dialog) {
   *out_close_dialog = true;
 }
 
 bool ProfileSigninConfirmationDialog::ShouldShowDialogTitle() const {
   return true;
 }