MD Settings: Use FireWebUIListener() helper wherever possible.

chrome/browser/ui/webui/settings/settings_startup_pages_handler.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 "chrome/browser/ui/webui/settings/settings_startup_pages_handler.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 64 matching lines @@
   for (int i = 0; i < page_count; ++i) {
     std::unique_ptr<base::DictionaryValue> entry(new base::DictionaryValue());
     entry->SetString("title", startup_custom_pages_table_model_.GetText(i, 0));
     entry->SetString("url", urls[i].spec());
     entry->SetString("tooltip",
                      startup_custom_pages_table_model_.GetTooltip(i));
     entry->SetInteger("modelIndex", i);
     startup_pages.Append(std::move(entry));
   }
 
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("update-startup-pages"), startup_pages);
+  FireWebUIListener("update-startup-pages", startup_pages);
 }
 
 void StartupPagesHandler::OnItemsChanged(int start, int length) {
   OnModelChanged();
 }
 
 void StartupPagesHandler::OnItemsAdded(int start, int length) {
   OnModelChanged();
 }
 
@@ skipping 96 matching lines @@
 
 void StartupPagesHandler::UpdateStartupPages() {
   const SessionStartupPref startup_pref = SessionStartupPref::GetStartupPref(
       Profile::FromWebUI(web_ui())->GetPrefs());
   startup_custom_pages_table_model_.SetURLs(startup_pref.urls);
   // The change will go to the JS code in the
   // StartupPagesHandler::OnModelChanged() method.
 }
 
 }  // namespace settings