To reproduce issue follow the steps:
1. Create new project
2. Open new scene
3. Create the script with following code and attach to any GameObject in the scene
void Start () {
bool p = PlayerSettings.useDirect3D11;
}
4. Run the scene
5. Console throws this warning
Assets/NewBehaviourScript.cs(8,41): warning CS0618: `UnityEditor.PlayerSettings.useDirect3D11' is obsolete: `Use SetGraphicsAPIs/GetGraphicsAPIs instead'

More precise behavior would be:
warning CS0618: `UnityEditor.PlayerSettings.useDirect3D11' is obsolete: `Use UnityEditor.PlayerSettings.SetGraphicsAPIs/GetGraphicsAPIs instead'

Reproduced in 5.4.0b13