Remove slan@ from chromecast OWNERS

Change-Id: Ia56a9b605860cb8911bc3e94791760e1ad2b7664
Reviewed-on: https://chromium-review.googlesource.com/c/1303396Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607278}

chromecast/OWNERS

 halliwell@chromium.org
 servolk@chromium.org
-slan@chromium.org
 
 # Android
 per-file *android*=file://chromecast/android/OWNERS

chromecast/device/bluetooth/OWNERS

-bcf@chromium.org
-slan@chromium.org

device/bluetooth/cast/OWNERS

-slan@chromium.org
-bcf@chromium.org
+halliwell@chromium.org