Add DIR_METADATA files to //jingle

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

R=thestig@chromium.org

Bug: 1113033
Change-Id: I8a6fa48aae3ea742fb4092fafe1250f5710fc067
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454090
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814449}

jingle/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: "Blink>WebRTC"
+}
+team_email: "net-dev@chromium.org"
\ No newline at end of file

jingle/OWNERS

 sergeyu@chromium.org
-thestig@chromium.org
-# COMPONENT: Blink>WebRTC
-# TEAM: net-dev@chromium.org
+thestig@chromium.org
\ No newline at end of file

jingle/notifier/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>Printing"
+}
\ No newline at end of file

jingle/notifier/OWNERS

-# COMPONENT: Internals>Printing