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

webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc b/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
index ff64e49cafa482b4882d6c8f84e662b4a821165d..7537d8e5fbb9ae292c1d200c278e71193975f2cb 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
@@ -61,7 +61,7 @@ int32_t RTPReceiverVideo::ParseRtpPacket(WebRtcRTPHeader* rtp_header,
                rtp_header->header.timestamp);
   rtp_header->type.Video.codec = specific_payload.Video.videoCodecType;
 
-  DCHECK_GE(payload_length, rtp_header->header.paddingLength);
+  RTC_DCHECK_GE(payload_length, rtp_header->header.paddingLength);
   const size_t payload_data_length =
       payload_length - rtp_header->header.paddingLength;