Add RTC_ prefix to (D)CHECKs and related macros.

webrtc/common_audio/include/audio_util.h

Index: webrtc/common_audio/include/audio_util.h
diff --git a/webrtc/common_audio/include/audio_util.h b/webrtc/common_audio/include/audio_util.h
index d8e1ce378e4007b09dbbbacc7cdf0e5ae96e92fd..2c0028ce90d637932366e8ccbf6e992689c6c6eb 100644
--- a/webrtc/common_audio/include/audio_util.h
+++ b/webrtc/common_audio/include/audio_util.h
@@ -154,8 +154,8 @@ void DownmixInterleavedToMonoImpl(const T* interleaved,
                                   size_t num_frames,
                                   int num_channels,
                                   T* deinterleaved) {
-  DCHECK_GT(num_channels, 0);
-  DCHECK_GT(num_frames, 0u);
+  RTC_DCHECK_GT(num_channels, 0);
+  RTC_DCHECK_GT(num_frames, 0u);
 
   const T* const end = interleaved + num_frames * num_channels;