vabr to watch custom_handlers

The poor custom_handlers don't have a specific OWNER.
vabr@ will try to do drive-bys for them and apply to become an OWNER later based on that experience.

This is trying to address the suggestion in https://codereview.chromium.org/687683004/#msg11.

[email protected]
BUG=395085
NOTRY=true

Review URL: https://codereview.chromium.org/733063002

Cr-Commit-Position: refs/heads/master@{#304410}
1 file changed