Move //chrome/browser/{chromeos => ash}/guest_os

This CL is part of the Chrome OS source code directory migration:
https://docs.google.com/document/d/1g-98HpzA8XcoGBWUv1gQNr4rbnD5yfvbtYZyPDDbkaE.

Bug: 1164001
Change-Id: Ie7eb56e74e17bd7fa63943f7c1f870fd21d8cb71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2793245
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Owners-Override: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yeunjoo Choi <ychoi@igalia.com>
Cr-Commit-Position: refs/heads/master@{#867923}
GitOrigin-RevId: 0a9c1d4d7aac8c7467ecfc887c2f4611a4a53017
diff --git a/OWNERS b/OWNERS
index 31c2e6c..b41d1da 100644
--- a/OWNERS
+++ b/OWNERS
@@ -7,4 +7,4 @@
 per-file braille_display_private.js=file://ui/accessibility/OWNERS
 per-file file_manager_private.js=file://ui/file_manager/OWNERS
 per-file input_method_private.js=file://ui/base/ime/OWNERS
-per-file terminal_private.js=file://chrome/browser/chromeos/guest_os/OWNERS
+per-file terminal_private.js=file://chrome/browser/ash/guest_os/OWNERS