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

webrtc/video_engine/encoder_state_feedback.cc

Index: webrtc/video_engine/encoder_state_feedback.cc
diff --git a/webrtc/video_engine/encoder_state_feedback.cc b/webrtc/video_engine/encoder_state_feedback.cc
index 55a0c4394660876d28c43b0e2d204665c042b311..4d744acd0a1a55379d1e19d95f8a406b09d90aec 100644
--- a/webrtc/video_engine/encoder_state_feedback.cc
+++ b/webrtc/video_engine/encoder_state_feedback.cc
@@ -56,10 +56,10 @@ EncoderStateFeedback::~EncoderStateFeedback() {
 
 void EncoderStateFeedback::AddEncoder(const std::vector<uint32_t>& ssrcs,
                                       ViEEncoder* encoder) {
-  DCHECK(!ssrcs.empty());
+  RTC_DCHECK(!ssrcs.empty());
   CriticalSectionScoped lock(crit_.get());
   for (uint32_t ssrc : ssrcs) {
-    DCHECK(encoders_.find(ssrc) == encoders_.end());
+    RTC_DCHECK(encoders_.find(ssrc) == encoders_.end());
     encoders_[ssrc] = encoder;
   }
 }