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

Bug: chromium:1203176
Change-Id: I7f810c496dc1806c030e7292a319624d45c33fa1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2851829Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>