Remove dead code

Review URL: https://codereview.webrtc.org/1452153003

Cr-Original-Commit-Position: refs/heads/master@{#10692}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 223692aa857192ed1764737ecae086523dc03f84
1 file changed