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

webrtc/modules/audio_coding/main/acm2/acm_send_test.cc

Index: webrtc/modules/audio_coding/main/acm2/acm_send_test.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/acm_send_test.cc b/webrtc/modules/audio_coding/main/acm2/acm_send_test.cc
index 91df16fe8aef9cfad69278d0cc00f0601def2cc6..b05968645cc4aefcec2a3ec7c1a741905166db24 100644
--- a/webrtc/modules/audio_coding/main/acm2/acm_send_test.cc
+++ b/webrtc/modules/audio_coding/main/acm2/acm_send_test.cc
@@ -71,7 +71,8 @@ Packet* AcmSendTest::NextPacket() {
   // Insert audio and process until one packet is produced.
   while (clock_.TimeInMilliseconds() < test_duration_ms_) {
     clock_.AdvanceTimeMilliseconds(kBlockSizeMs);
-    CHECK(audio_source_->Read(input_block_size_samples_, input_frame_.data_));
+    RTC_CHECK(
+        audio_source_->Read(input_block_size_samples_, input_frame_.data_));
     if (input_frame_.num_channels_ > 1) {
       InputAudioFile::DuplicateInterleaved(input_frame_.data_,
                                            input_block_size_samples_,