Add DIR_METADATA files to //native_client_sdk

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

R=sbc@chromium.org

Bug: 1113033
Change-Id: I6624ab46edbee706de8f0fcbab959b366e12fa40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454495
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Sam Clegg <sbc@chromium.org>
Reviewed-by: Sam Clegg <sbc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814470}

native_client_sdk/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: "Platform>NaCl"
+}
+team_email: "chromium-reviews@chromium.org"
\ No newline at end of file

native_client_sdk/OWNERS

 binji@chromium.org
 bradnelson@chromium.org
-sbc@chromium.org
-# COMPONENT: Platform>NaCl
+sbc@chromium.org
\ No newline at end of file
-# TEAM: chromium-reviews@chromium.org