| // Copyright 2025 The Chromium Authors | 
 | // Use of this source code is governed by a BSD-style license that can be | 
 | // found in the LICENSE file. | 
 |  | 
 | #include "chrome/browser/ash/browser_delegate/browser_controller.h" | 
 |  | 
 | #include "base/check.h" | 
 | #include "base/check_op.h" | 
 |  | 
 | namespace { | 
 | ash::BrowserController* g_browser_controller = nullptr; | 
 | }  // namespace | 
 |  | 
 | namespace ash { | 
 |  | 
 | BrowserController* BrowserController::GetInstance() { | 
 |   return g_browser_controller; | 
 | } | 
 |  | 
 | BrowserController::BrowserController() { | 
 |   CHECK(!g_browser_controller); | 
 |   g_browser_controller = this; | 
 | } | 
 |  | 
 | BrowserController::~BrowserController() { | 
 |   CHECK_EQ(g_browser_controller, this); | 
 |   g_browser_controller = nullptr; | 
 | } | 
 |  | 
 | }  // namespace ash |