Removes unused WaveOut APIs from ADM

webrtc/modules/audio_device/audio_device_impl.h

Index: webrtc/modules/audio_device/audio_device_impl.h
diff --git a/webrtc/modules/audio_device/audio_device_impl.h b/webrtc/modules/audio_device/audio_device_impl.h
index 072039003e38e9e49ad5b300b6d7a87f8cea80bf..9fdc93bd0cf5076614d1a5ede6b5aa2a8ec17d8f 100644
--- a/webrtc/modules/audio_device/audio_device_impl.h
+++ b/webrtc/modules/audio_device/audio_device_impl.h
@@ -98,11 +98,6 @@ class AudioDeviceModuleImpl : public AudioDeviceModule {
   int32_t SetAGC(bool enable) override;
   bool AGC() const override;
 
-  // Volume control based on the Windows Wave API (Windows only)
-  int32_t SetWaveOutVolume(uint16_t volumeLeft, uint16_t volumeRight) override;
-  int32_t WaveOutVolume(uint16_t* volumeLeft,
-                        uint16_t* volumeRight) const override;
-
   // Audio mixer initialization
   int32_t InitSpeaker() override;
   bool SpeakerIsInitialized() const override;