This is done in preparation to make all javac warnings into errors for WebRTC targets. Bug: webrtc:6597 Change-Id: I402043157bd75943adf0de52111e5a1bb179c6d1 Reviewed-on: https://webrtc-review.googlesource.com/15104 Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20450}