Fix busy loop in FakeAudioDeviceModule.
The implementation now has a mechanism that effectively turns off callbacks if used.

BUG=webrtc:7237, 695438
TBR=solenberg@webrtc.org

Review-Url: https://codereview.webrtc.org/2710023010
Cr-Original-Commit-Position: refs/heads/master@{#16837}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4af9f962c3a79b97c4b2d85be4c30c9b77ef7a21
1 file changed