Add #COMPONENT to WebRTC.

This associates WebRTC with the right bug component in Chromium.

No-Try: True
Bug: chromium:977050
Change-Id: I0ab5707fbd70558b08c69cbf1200f16898038d07
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156080
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29402}
diff --git a/OWNERS b/OWNERS
index ef565af..cd9d3d0 100644
--- a/OWNERS
+++ b/OWNERS
@@ -19,3 +19,5 @@
 per-file style-guide.md=danilchap@webrtc.org
 per-file style-guide.md=kwiberg@webrtc.org
 per-file native-api.md=kwiberg@webrtc.org
+
+# COMPONENT: Internals>WebRTC