Add missing methods to WebRtcAudioDeviceNotImpl.
These will become pure virtual in WebRTC, so we need an implementation of them here, see https://codereview.webrtc.org/2222563002/

BUG=webrtc:6170

Review-Url: https://codereview.chromium.org/2225263003
Cr-Commit-Position: refs/heads/master@{#411947}
2 files changed