Add # COMPONENT: Internals>Network>Certificate

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: I61b0a36ee57a983ccbdb68160cc0b11f13fbba2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808172
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698403}

components/certificate_matching/OWNERS

 file://chromeos/policy/OWNERS
 file://chromeos/network/OWNERS
+
+# COMPONENT: Internals>Network>Certificate