cleanup: Use EventRouter instead of ExtensionSystem::Get->event_router()

chrome/browser/extensions/api/preference/chrome_direct_setting_api.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/extensions/api/preference/chrome_direct_setting_api.h"
 
 #include "base/bind.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 24 matching lines @@
 
   void RegisterEventListeners(
       Profile* profile,
       EventRouter::Observer* observer) {
     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
          iter != whitelist_.end();
          iter++) {
       std::string event_name = base::StringPrintf(
           kOnPrefChangeFormat,
           (*iter).c_str());
-      ExtensionSystem::Get(profile)->event_router()->RegisterObserver(
-          observer,
-          event_name);
+      EventRouter::Get(profile)->RegisterObserver(observer, event_name);
     }
   }
 
   void RegisterPropertyListeners(
       Profile* profile,
       PrefChangeRegistrar* registrar,
       const base::Callback<void(const std::string&)>& callback) {
     for (base::hash_set<std::string>::iterator iter = whitelist_.begin();
          iter != whitelist_.end();
          iter++) {
@@ skipping 29 matching lines @@
 void ChromeDirectSettingAPI::Shutdown() {}
 
 // BrowserContextKeyedAPI implementation.
 BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>*
 ChromeDirectSettingAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 // EventRouter::Observer implementation.
 void ChromeDirectSettingAPI::OnListenerAdded(const EventListenerInfo& details) {
-  ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
+  EventRouter::Get(profile_)->UnregisterObserver(this);
   registrar_.Init(profile_->GetPrefs());
   preference_whitelist.Get().RegisterPropertyListeners(
       profile_,
       &registrar_,
       base::Bind(&ChromeDirectSettingAPI::OnPrefChanged,
                  base::Unretained(this),
                  registrar_.prefs()));
 }
 
 bool ChromeDirectSettingAPI::IsPreferenceOnWhitelist(
     const std::string& pref_key) {
   return preference_whitelist.Get().IsPreferenceOnWhitelist(pref_key);
 }
 
 ChromeDirectSettingAPI* ChromeDirectSettingAPI::Get(
     content::BrowserContext* context) {
   return BrowserContextKeyedAPIFactory<ChromeDirectSettingAPI>::Get(context);
 }
 
 // BrowserContextKeyedAPI implementation.
 const char* ChromeDirectSettingAPI::service_name() {
   return "ChromeDirectSettingAPI";
 }
 
 void ChromeDirectSettingAPI::OnPrefChanged(
     PrefService* pref_service, const std::string& pref_key) {
   std::string event_name = base::StringPrintf(kOnPrefChangeFormat,
                                               pref_key.c_str());
-  EventRouter* router = ExtensionSystem::Get(profile_)->event_router();
+  EventRouter* router = EventRouter::Get(profile_);
   if (router && router->HasEventListener(event_name)) {
     const PrefService::Preference* preference =
         profile_->GetPrefs()->FindPreference(pref_key.c_str());
     const base::Value* value = preference->GetValue();
 
     scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue);
     result->Set(preference_api_constants::kValue, value->DeepCopy());
     base::ListValue args;
     args.Append(result.release());
 
     ExtensionService* extension_service =
         ExtensionSystem::Get(profile_)->extension_service();
     const ExtensionSet* extensions = extension_service->extensions();
     for (ExtensionSet::const_iterator it = extensions->begin();
          it != extensions->end(); ++it) {
       if ((*it)->location() == Manifest::COMPONENT) {
         std::string extension_id = (*it)->id();
         if (router->ExtensionHasEventListener(extension_id, event_name)) {
           scoped_ptr<base::ListValue> args_copy(args.DeepCopy());
           scoped_ptr<Event> event(new Event(event_name, args_copy.Pass()));
           router->DispatchEventToExtension(extension_id, event.Pass());
         }
       }
     }
   }
 }
 
 }  // namespace chromedirectsetting
 }  // namespace extensions