Was renamed to AdaptationObserverInterface in cl https://codereview.webrtc.org/2652893015/. Bug: webrtc:4172 Change-Id: Ie2194a1fd5fe985913716963292af701006f18dd Reviewed-on: https://webrtc-review.googlesource.com/6420 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20155}