Enabling 'gn check' on //webrtc/ortc.

BUG=webrtc:6828

Review-Url: https://codereview.webrtc.org/2804663002
Cr-Original-Commit-Position: refs/heads/master@{#17642}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: cde2528d28b4ca354e1dbf27ace0922c91f42671
1 file changed