[Autofill sync] Make //components/sync/OWNERS own autofill sync bridges

This CL makes all sync owners own autofill sync bridges. The current
owner from the sync team (jkrcal@) is left there to indicate who is the
primary POC for this code.

Bug: 853688
Change-Id: I0a5d26ccbbd75b86033b853e37fc29a1998050ea
Reviewed-on: https://chromium-review.googlesource.com/1148578Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577615}

components/autofill/core/browser/webdata/OWNERS

 per-file *sync_bridge*=jkrcal@chromium.org
+per-file *sync_bridge*=file://components/sync/OWNERS