Add DIR_METADATA files to //headless

Add Generate DIR_METADATA files and remove metadata from OWNERS
files for //headless.

R=irisu@chromium.org

Bug: 1113033
Change-Id: I5422ec3d1fc43125fe06823aea4e9ce2ff7fede1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454383
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815407}

headless/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: "Internals>Headless"
+}
+team_email: "headless-dev@chromium.org"
\ No newline at end of file

headless/OWNERS

@@ -13,6 +13,3 @@ altimin@chromium.org
 dvallet@chromium.org
 irisu@chromium.org
 jzfeng@chromium.org
-
-# TEAM: headless-dev@chromium.org
-# COMPONENT: Internals>Headless