Add vabr to chrome/renderer/autofill/OWNERS for password stuff
Add vabr to chrome/renderer/autofill/OWNERS for password stuff

Also, use per-file to formalise the scope for vabr and gcasto.

TBR=isherman@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/1147973005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#331093}

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