Also removes unused track states kLive and kFailed. Since this also required a Video source to exist in all unit tests that create a track, a FakeVideoTrackSource is added and used in tests. BUG=webrtc:5426 Review URL: https://codereview.webrtc.org/1790633002 Cr-Commit-Position: refs/heads/master@{#12098}
This is a work-in-progress to update the Objective-C API according to the W3C specification. The Objective-C API located at talk/app/webrtc/objc is deprecated, but will remain for the time being.