| // Copyright 2023 The Chromium Authors | 
 | // Use of this source code is governed by a BSD-style license that can be | 
 | // found in the LICENSE file. | 
 |  | 
 | #include "media_session_client.h" | 
 |  | 
 | #include "base/check.h" | 
 |  | 
 | namespace content { | 
 |  | 
 | namespace { | 
 | MediaSessionClient* g_client = nullptr; | 
 | } | 
 |  | 
 | MediaSessionClient::MediaSessionClient() { | 
 |   CHECK(!g_client); | 
 |   g_client = this; | 
 | } | 
 |  | 
 | MediaSessionClient::~MediaSessionClient() { | 
 |   g_client = nullptr; | 
 | } | 
 |  | 
 | // static | 
 | MediaSessionClient* MediaSessionClient::Get() { | 
 |   return g_client; | 
 | } | 
 |  | 
 | }  // namespace content |