Add DIR_METADATA files to directories under //third_party

Generate DIR_METADATA files and remove metadata from OWNERS
files for directories under //third_party.

Bug: 1113033
Change-Id: I132498741f951890f4137330908c1722f1e84163
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492640
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819929}
GitOrigin-RevId: 7c1104a1727e87b9b09cf2bd9d4577d8fbd1413c
diff --git a/DIR_METADATA b/DIR_METADATA
new file mode 100644
index 0000000..14b5edb
--- /dev/null
+++ b/DIR_METADATA
@@ -0,0 +1,3 @@
+monorail {
+  component: "Internals"
+}
diff --git a/OWNERS b/OWNERS
index 6a57e5d..8edbdf8 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,5 +1,3 @@
 timloh@chromium.org
 haraken@chromium.org
 nbarth@chromium.org
-
-# COMPONENT: Internals