kwiberg 84f6a3fc6b Move optional.h to webrtc/api/ ...

We use Optional in our public API, so its header should be in
webrtc/api/.

BUG=webrtc:8205

Review-Url: https://codereview.webrtc.org/3011943002
Cr-Commit-Position: refs/heads/master@{#19693}

2017-09-05 15:43:13 +00:00

..

neteq.h

Move optional.h to webrtc/api/

2017-09-05 15:43:13 +00:00