Currently, no ANGLE platform flag is enabled for Lacros Chrome.
GL is selected as default by this change for ChromeOS in general.

Based on change by Eriko Kurimoto <elkurin@chromium.org>

Bug: chromium:1203176
Change-Id: I539a459b6d3db60da191570e933afd8d06d3c3eb
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2877010Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>