Specifically for base and libplatform I was the only owner. Adding mlippautz@
there.

R=danno@chromium.org

Change-Id: I246b72141abc932d9caf7dcb7485e458283d4a9f
Reviewed-on: https://chromium-review.googlesource.com/551899Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46275}