Move metadata in OWNERS files to DIR_METADATA files

Bug: chromium:1113033
Change-Id: I62504dff4c421eafe2dd23465a85f73c6b8c5a21
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2673686
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>

DIR_METADATA

@@ -0,0 +1,4 @@
+monorail {
+  component: "Internals>GPU>ANGLE"
+}
+team_email: "angleproject@googlegroups.com"

OWNERS

@@ -13,6 +13,3 @@ per-file AUTHORS=*
 per-file CONTRIBUTORS=*
 per-file DEPS=*
 per-file WATCHLISTS=*
-
-# COMPONENT: Internals>GPU>ANGLE
-# TEAM: angleproject@googlegroups.com