Remove unnecessary components/sync android OWNERS

These files don't see much change but we haven't worked on it in a while.
Reviews should be handled by sync team.

Change-Id: I34bfe50795e65ac1ce87f74eea26c8f42b5b9011
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758301
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Tim Schumann <tschumann@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688539}

components/sync/android/OWNERS

-nyquist@chromium.org
-yfriedman@chromium.org

components/sync/test/android/OWNERS

-nyquist@chromium.org
-shashishekhar@chromium.org
-yfriedman@chromium.org