Forward OWNERS to components/performance_manager

Change-Id: I29b49b538872f7f618ff5b1e08cb30526de0f453
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218754
Auto-Submit: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772372}

chrome/browser/resources/discards/OWNERS

-file://services/resource_coordinator/OWNERS
+file://components/performance_manager/OWNERS