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

webrtc/voice_engine/test/auto_test/fakes/loudest_filter.cc

Index: webrtc/voice_engine/test/auto_test/fakes/loudest_filter.cc
diff --git a/webrtc/voice_engine/test/auto_test/fakes/loudest_filter.cc b/webrtc/voice_engine/test/auto_test/fakes/loudest_filter.cc
index 29dda630d7add6f8b5c8fa7dd87a55905d9ce4e5..9d7239e6d589c579eca8cab9258f837a50797fa3 100644
--- a/webrtc/voice_engine/test/auto_test/fakes/loudest_filter.cc
+++ b/webrtc/voice_engine/test/auto_test/fakes/loudest_filter.cc
@@ -68,7 +68,7 @@ bool LoudestFilter::ForwardThisPacket(const webrtc::RTPHeader& rtp_header) {
   }
 
   unsigned int quietest_ssrc = FindQuietestStream();
-  CHECK_NE(0u, quietest_ssrc);
+  RTC_CHECK_NE(0u, quietest_ssrc);
   // A smaller value if audio level corresponds to a louder sound.
   if (audio_level < stream_levels_[quietest_ssrc].audio_level) {
     stream_levels_.erase(quietest_ssrc);