Removed unused screencast APIs. BUG=webrtc:5426 Review URL: https://codereview.webrtc.org/1757843003 Cr-Commit-Position: refs/heads/master@{#11896}
Removed unused screencast APIs. BUG=webrtc:5426 Review URL: https://codereview.webrtc.org/1757843003 Cr-Commit-Position: refs/heads/master@{#11896}