Remove VoECodec from FakeWebRtcVoiceEngine.

BUG=webrtc:4690

Review-Url: https://codereview.webrtc.org/2785443002
Cr-Original-Commit-Position: refs/heads/master@{#17420}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 83862e3c14a39065cb87e86a61536355f1c9284f
3 files changed