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

chrome/browser/extensions/api/audio/audio_api.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/extensions/api/audio/audio_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/audio.h"
 #include "extensions/browser/event_router.h"
-#include "extensions/browser/extension_system.h"
 
 namespace extensions {
 
 namespace audio = api::audio;
 
 static base::LazyInstance<BrowserContextKeyedAPIFactory<AudioAPI> > g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<AudioAPI>* AudioAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 AudioAPI::AudioAPI(content::BrowserContext* context)
     : browser_context_(context), service_(AudioService::CreateInstance()) {
   service_->AddObserver(this);
 }
 
 AudioAPI::~AudioAPI() {
   service_->RemoveObserver(this);
   delete service_;
   service_ = NULL;
 }
 
 AudioService* AudioAPI::GetService() const {
   return service_;
 }
 
 void AudioAPI::OnDeviceChanged() {
-  if (browser_context_ &&
-      ExtensionSystem::Get(browser_context_)->event_router()) {
+  if (browser_context_ && EventRouter::Get(browser_context_)) {
     scoped_ptr<Event> event(new Event(
         audio::OnDeviceChanged::kEventName,
         scoped_ptr<base::ListValue>(new base::ListValue())));
-    ExtensionSystem::Get(browser_context_)->event_router()->BroadcastEvent(
-        event.Pass());
+    EventRouter::Get(browser_context_)->BroadcastEvent(event.Pass());
   }
 }
 
 bool AudioGetInfoFunction::RunImpl() {
   AudioService* service =
       AudioAPI::GetFactoryInstance()->Get(GetProfile())->GetService();
   DCHECK(service);
   service->StartGetInfo(base::Bind(&AudioGetInfoFunction::OnGetInfoCompleted,
                                    this));
   return true;
@@ skipping 40 matching lines @@
   if (!service->SetDeviceProperties(params->id,
                                     params->properties.is_muted,
                                     volume_value,
                                     gain_value))
     return false;
   else
     return true;
 }
 
 }  // namespace extensions