Add gsathya to parsing/OWNERS

Also remove vogelheim (no longer on the team) for clarity.

Change-Id: Ida6d058252f17b71bb158308657ae2d18b52c2b2
Reviewed-on: https://chromium-review.googlesource.com/703161Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48345}

src/parsing/OWNERS

 set noparent
 
 adamk@chromium.org
+gsathya@chromium.org
 littledan@chromium.org
 marja@chromium.org
 neis@chromium.org
 rossberg@chromium.org
 verwaest@chromium.org
-vogelheim@chromium.org
 
 # COMPONENT: Blink>JavaScript>Parser