Fix play block size mismatch in Win audio device.

webrtc/modules/audio_device/win/audio_device_core_win.h

Index: webrtc/modules/audio_device/win/audio_device_core_win.h
diff --git a/webrtc/modules/audio_device/win/audio_device_core_win.h b/webrtc/modules/audio_device/win/audio_device_core_win.h
index cb8001021d7263b97a3a9b8b5e2469a58a258f3b..812b96b468806d246c1791df884533a453a31bbf 100644
--- a/webrtc/modules/audio_device/win/audio_device_core_win.h
+++ b/webrtc/modules/audio_device/win/audio_device_core_win.h
@@ -313,8 +313,8 @@ private:    // thread functions
     UINT                                    _playAudioFrameSize;
     uint32_t                          _playSampleRate;
     uint32_t                          _devicePlaySampleRate;
-    uint32_t                          _playBlockSizePerChannel;
-    uint32_t                          _playBlockSize;
+    uint32_t                          _playBlockSizeInFrames;
+    uint32_t                          _playBlockSizeInSamples;
     uint32_t                          _devicePlayBlockSize;
     uint32_t                          _playChannels;
     uint32_t                          _sndCardPlayDelay;