Coalesce all of the individual contributors from Microsoft in AUTHORS file into *@microsoft.com.

Change-Id: Ic0e7e01e8055b426c86fee2a5af2174f071c872a
Reviewed-on: https://chromium-review.googlesource.com/c/1385504Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#58382}