Remove VoEHardware interface.

BUG=webrtc:4690

Review-Url: https://codereview.webrtc.org/2753753004
Cr-Original-Commit-Position: refs/heads/master@{#17255}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5b3e49a29e442bb6b5cb4a8a1d9496566887e212
15 files changed