Files app: Remove Stuart, Sam and Anand from OWNERS

All of them aren't working on Files app anymore so can be spared from
the occasional code review for it.

Thank you all for your time served with us!

Change-Id: I58ddb08e6fc49a0ad49500912c67124793764740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536419
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Anand K Mistry <amistry@chromium.org>
Reviewed-by: Stuart Langley <slangley@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828455}

ui/file_manager/OWNERS

 adanilo@chromium.org
-amistry@chromium.org
 austinct@chromium.org
 dats@chromium.org
 fdegros@chromium.org
@@ -8,7 +7,5 @@ jboulic@chromium.org
 joelhockey@chromium.org
 lucmult@chromium.org
 noel@chromium.org
-sammc@chromium.org
 simmonsjosh@google.com
-slangley@chromium.org
-# COMPONENT: Platform>Apps>FileManager
+# COMPONENT: Platform>Apps>FileManager
\ No newline at end of file