Became unused with cl https://webrtc-review.googlesource.com/40740, and last spurious reference dropped in cl https://webrtc-review.googlesource.com/43360. Bug: None Change-Id: Ib5f27a437c1ae8f7cc2df84d6d9eda8c297481d6 Reviewed-on: https://webrtc-review.googlesource.com/76981 Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23255}