Move {Resolve|Reject}JavascriptCallback helpers in WebUIMessageHandler.

chrome/browser/ui/webui/signin/user_manager_screen_handler.cc

 // Copyright 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/user_manager_screen_handler.h"
 
 #include <stddef.h>
 #include <utility>
 #include <vector>
 
@@ skipping 484 matching lines @@
   }
 }
 
 void UserManagerScreenHandler::HandleAreAllProfilesLocked(
     const base::ListValue* args) {
   std::string webui_callback_id;
   CHECK_EQ(1U, args->GetSize());
   bool success = args->GetString(0, &webui_callback_id);
   DCHECK(success);
 
-  web_ui()->CallJavascriptFunctionUnsafe(
-      "cr.webUIResponse", base::StringValue(webui_callback_id),
-      base::FundamentalValue(true),
+  AllowJavascript();
+  ResolveJavascriptCallback(
+      base::StringValue(webui_callback_id),
       base::FundamentalValue(profiles::AreAllProfilesLocked()));
 }
 
 void UserManagerScreenHandler::HandleLaunchUser(const base::ListValue* args) {
   const base::Value* profile_path_value = NULL;
   if (!args->Get(0, &profile_path_value))
     return;
 
   base::FilePath profile_path;
   if (!base::GetValueAsFilePath(*profile_path_value, &profile_path))
@@ skipping 494 matching lines @@
     Profile* profile, Profile::CreateStatus profile_create_status) {
   Browser* browser = chrome::FindAnyBrowser(profile, false);
   if (browser && browser->window()) {
     OnBrowserWindowReady(browser);
   } else {
     registrar_.Add(this,
                    chrome::NOTIFICATION_BROWSER_WINDOW_READY,
                    content::NotificationService::AllSources());
   }
 }