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

webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red_unittest.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 69 matching lines @@
  public:
   MockEncodeHelper() : write_payload_(false), payload_(NULL) {
     memset(&info_, 0, sizeof(info_));
   }
 
   AudioEncoder::EncodedInfo Encode(uint32_t timestamp,
                                    const int16_t* audio,
                                    size_t max_encoded_bytes,
                                    uint8_t* encoded) {
     if (write_payload_) {
-      CHECK(encoded);
-      CHECK_LE(info_.encoded_bytes, max_encoded_bytes);
+      RTC_CHECK(encoded);
+      RTC_CHECK_LE(info_.encoded_bytes, max_encoded_bytes);
       memcpy(encoded, payload_, info_.encoded_bytes);
     }
     return info_;
   }
 
   AudioEncoder::EncodedInfo info_;
   bool write_payload_;
   uint8_t* payload_;
 };
 
@@ skipping 223 matching lines @@
   config.speech_encoder = NULL;
   EXPECT_DEATH(red = new AudioEncoderCopyRed(config),
                "Speech encoder not provided.");
   // The delete operation is needed to avoid leak reports from memcheck.
   delete red;
 }
 
 #endif  // GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
 
 }  // namespace webrtc