[BackgroundSync] Add Peter as OWNER of bgsync

Change-Id: I2939d0b4f8e82f241f8b80d91417b2bb3483bf5d
Reviewed-on: https://chromium-review.googlesource.com/c/1312683
Commit-Queue: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: Peter Beverloo <peter@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604646}

chrome/browser/background_sync/OWNERS

 iclelland@chromium.org
 jkarlin@chromium.org
+peter@chromium.org
 
 per-file *permission_context*=file://chrome/browser/permissions/PERMISSIONS_OWNERS
 

content/browser/background_sync/OWNERS

 iclelland@chromium.org
 jkarlin@chromium.org
+peter@chromium.org
 
 # COMPONENT: Blink>BackgroundSync

third_party/blink/public/platform/modules/background_sync/OWNERS

 iclelland@chromium.org
 jkarlin@chromium.org
+peter@chromium.org
 
 per-file *.mojom=set noparent
 per-file *.mojom=file://ipc/SECURITY_OWNERS

third_party/blink/renderer/modules/background_sync/OWNERS

 iclelland@chromium.org
 jkarlin@chromium.org
+peter@chromium.org
 
 # COMPONENT: Blink>BackgroundSync