If WEBRTC_DUMMY_FILE_DEVICES is set, WEBRTC_CORE_AUDIO_BUILD should not. Otherwise audio_device_core_win.h will be included [1] when it shouldn't (according to [2]). [1] https://webrtc.googlesource.com/src/+/master/modules/audio_device/audio_device_impl.cc#22 [2] https://webrtc.googlesource.com/src/+/master/modules/audio_device/BUILD.gn#177 Bug: webrtc:6265 Change-Id: Ia6ccb9dda39f411c0d8a548a0501408e87d11a40 Reviewed-on: https://webrtc-review.googlesource.com/16430 Reviewed-by: Oleh Prypin <oprypin@webrtc.org> Reviewed-by: Henrik Andreassson <henrika@webrtc.org> Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20464}