Intiialize AudioManager and related class lazily

content/public/browser/media_device_id.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 "content/public/browser/media_device_id.h"
 
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 
 namespace content {
 
@@ skipping 11 matching lines @@
   return MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
       salt, security_origin, device_guid, raw_unique_id);
 }
 
 bool GetMediaDeviceIDForHMAC(MediaStreamType stream_type,
                              const std::string& salt,
                              const url::Origin& security_origin,
                              const std::string& source_id,
                              std::string* device_id) {
   content::MediaStreamManager* manager =
-      content::BrowserMainLoop::GetInstance()->media_stream_manager();
+      content::BrowserMainLoop::GetInstance()->GetMediaStreamManager();
 
   return manager->TranslateSourceIdToDeviceId(
       content::MEDIA_DEVICE_VIDEO_CAPTURE, salt, security_origin, source_id,
       device_id);
 }
 
 }  // namespace content