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>
diff --git a/dev-install/dev_install b/dev-install/dev_install
index 5e8d971..422d90c 100755
--- a/dev-install/dev_install
+++ b/dev-install/dev_install
@@ -180,16 +180,16 @@
 }
 
 install_optional_packages() {
-  # Install gmerge manually first (even though it's part of chromeos-dev)
-  # since it provides its own list of package.provided files.  Other packages
-  # that chromeos-dev pulls in might rely on those lists, so we need them
-  # sooner rather than later.
+  # Install gmerge manually first (even though it's part of the default
+  # virtual/target-os-dev) since it provides its own list of package.provided
+  # files.  Other packages that virtual/target-os-dev pulls in might rely on
+  # those lists, so we need them sooner rather than later.
   emerge gmerge
-  if yes_or_no "Install chromeos-dev package now"; then
-    emerge chromeos-dev
+  if yes_or_no "Install virtual/target-os-dev package now"; then
+    emerge virtual/target-os-dev
   else
-    echo "You can install chromeos-dev later by typing the command:" \
-         "emerge chromeos-dev"
+    echo "You can install virtual/target-os-dev later by typing the command:" \
+         "emerge virtual/target-os-dev"
   fi
 }