Take more ownership of desktop capture realted files

Make braveyao own more desktop capture related files under
chrome/browser/media/webrtc, majorly including the new files added for
the getDisplayMedia() API.

Bug: 867003
Change-Id: Id1e310dc42ff8473c79d0f41de388fcb64597a56
NoTry: True
Reviewed-on: https://chromium-review.googlesource.com/1212097Reviewed-by: Tommi <tommi@chromium.org>
Commit-Queue: Weiyong Yao <braveyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589540}

chrome/browser/media/webrtc/OWNERS

 sergeyu@chromium.org
 tommi@chromium.org
 
+# For WebRTC desktop capturer related changes only
+braveyao@chromium.org
+
 # For WebRTC browser tests.
 per-file *webrtc*browsertest*=hbos@chromium.org
 per-file *webrtc*browsertest*=phoglund@chromium.org
@@ -12,10 +15,6 @@ per-file media_stream_capture_indicator*=miu@chromium.org
 per-file media_stream_device*=raymes@chromium.org
 per-file media_permission*=raymes@chromium.org
 
-# For WebRTC desktop capturer related changes only
-per-file *desktop*=braveyao@chromium.org
-per-file screen_capture*=braveyao@chromium.org
-
 # For WebRTC event logging code.
 per-file webrtc_event_log_*=eladalon@chromium.org