Remove stale OWNERS entry for rsesek.

Change-Id: I26f2de5ac35310127b503e1c41ab444a563a1d4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937587
Auto-Submit: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719328}

base/metrics/OWNERS

@@ -7,6 +7,4 @@ mpearson@chromium.org
 nikunjb@chromium.org
 rkaplow@chromium.org
 
-per-file field_trial_memory_mac*=rsesek@chromium.org
-
 # COMPONENT: Internals>Metrics