Add DIR_METADATA files to //dbus

Add Generate DIR_METADATA files and remove metatada from OWNERS files for //dbus.

R=hashimoto@chromium.org

Bug: 1113033
Change-Id: I5bf308445d3e27bb51792bd7c8c70e8d052b0049
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454690
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814545}

dbus/DIR_METADATA

+# Metadata information for this directory.
+#
+# For more information on DIR_METADATA files, see:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/README.md
+#
+# For the schema of this file, see Metadata message:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/proto/dir_metadata.proto
+
+monorail {
+  component: "OS>Systems"
+}
\ No newline at end of file

dbus/OWNERS

 hashimoto@chromium.org
 satorux@chromium.org
-stevenjb@chromium.org
-# COMPONENT: OS>Systems
+stevenjb@chromium.org
\ No newline at end of file