| Index: ash/mus/window_manager.cc | 
| diff --git a/ash/mus/window_manager.cc b/ash/mus/window_manager.cc | 
| index 53f0f6763bff8654f9cc087dcb2c7678d8efc7f6..4dfd26c12bc0a14a6c8d6f0b32ac47e01509093f 100644 | 
| --- a/ash/mus/window_manager.cc | 
| +++ b/ash/mus/window_manager.cc | 
| @@ -342,7 +342,8 @@ void WindowManager::OnEmbed( | 
| NOTREACHED(); | 
| } | 
|  | 
| -void WindowManager::OnEmbedRootDestroyed(aura::Window* root) { | 
| +void WindowManager::OnEmbedRootDestroyed( | 
| +    aura::WindowTreeHostMus* window_tree_host) { | 
| // WindowManager should never see this. | 
| NOTREACHED(); | 
| } | 
|  |