dev_install: 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 beaglebone-release` passes
TEST=`./buildbot/run_tests` passes
CQ-DEPEND=CL:194984

Change-Id: Iea498c311c576d6da25c8c8e350a1c1e599d88e8
Reviewed-on: https://chromium-review.googlesource.com/194966
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed