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

webrtc/modules/audio_coding/neteq/neteq_impl.cc

Index: webrtc/modules/audio_coding/neteq/neteq_impl.cc
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl.cc b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
index e6f7e60dbdafb5e29738b3ebf8f9b1379e977851..02e9324eee94eebda50b810c530e57da2f270179 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
@@ -840,7 +840,7 @@ int NetEqImpl::GetAudioInternal(size_t max_length,
     // lookahead by moving the index.
     const size_t missing_lookahead_samples =
         expand_->overlap_length() - sync_buffer_->FutureLength();
-    DCHECK_GE(sync_buffer_->next_index(), missing_lookahead_samples);
+    RTC_DCHECK_GE(sync_buffer_->next_index(), missing_lookahead_samples);
     sync_buffer_->set_next_index(sync_buffer_->next_index() -
                                  missing_lookahead_samples);
   }
@@ -856,7 +856,7 @@ int NetEqImpl::GetAudioInternal(size_t max_length,
   *samples_per_channel = output_size_samples_;
 
   // Should always have overlap samples left in the |sync_buffer_|.
-  DCHECK_GE(sync_buffer_->FutureLength(), expand_->overlap_length());
+  RTC_DCHECK_GE(sync_buffer_->FutureLength(), expand_->overlap_length());
 
   if (play_dtmf) {
     return_value = DtmfOverdub(dtmf_event, sync_buffer_->Channels(), output);