build_packages: default to building Chrome from source

Due to backported Chrome commits to the R83 branch, we no longer have
compatible prebuilts.  Disable this flag here so developers can build
Chrome from source.  This doesn't impact release builders as they will
always build from source.

BUG=chromium:1080704
TEST=None

Change-Id: Ic0d1a2bac49a79d1c9fa1613395c1470cc6850d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2197238
Reviewed-by: Alex Klein <saklein@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed