switch from chromeos-base/chromeos-dev to virtual/target-os-dev

This is mechanical -- virtual/target-os-dev depends on chromeos-dev,
so there shouldn't be any real difference in the build.

BUG=chromium:329920
TEST=`cbuildbot {arm,amd64,x86}-generic-full` pass
TEST=`cbuildbot beaglebone` passes
CQ-DEPEND=CL:194965
CQ-DEPEND=CL:194928

Change-Id: I4a48cee1c919ef540ccc13613e0f933680c38ea1
Reviewed-on: https://chromium-review.googlesource.com/194984
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
3 files changed