Also prevents that we try to restore audio mode when it has not been changed. TBR=glaznev BUG=NONE TEST=AppRTCDemo and verify that volume control switches from "Ringtone to Phone" mode when call starts and switches back to Ringtone mode when call ends. Review URL: https://webrtc-codereview.appspot.com/46879004 Cr-Commit-Position: refs/heads/master@{#8975}
Description
The idea is to make CMake build for WebRTC m130 version - for audio processing module
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