dev-cpp/abseil-cpp: Move from portage-stable to chromiumos-overlay

Modifications to the dev-cpp/abseil-cpp ebuild file need to be made that
will be carried over indefinitely, so remove here from portage-stable to
then move to chromiumos-overlay.

BUG=b:190216858
TEST=pass CQ

Cq-Depend: chromium:3399587
Change-Id: Ibcbad51f12edcc4e017d731688fb3ffa18a918ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3399704
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Sloan Johnson <sloanjohnson@google.com>
6 files changed