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

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc

 /*
  *  Copyright (c) 2015 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 86 matching lines @@
     encoder_->SetTargetBitrate(rate);
     EXPECT_EQ(rate, encoder_->GetTargetBitrate());
   }
 }
 
 namespace {
 
 // Returns a vector with the n evenly-spaced numbers a, a + (b - a)/(n - 1),
 // ..., b.
 std::vector<double> IntervalSteps(double a, double b, size_t n) {
-  DCHECK_GT(n, 1u);
+  RTC_DCHECK_GT(n, 1u);
   const double step = (b - a) / (n - 1);
   std::vector<double> points;
   for (size_t i = 0; i < n; ++i)
     points.push_back(a + i * step);
   return points;
 }
 
 // Sets the packet loss rate to each number in the vector in turn, and verifies
 // that the loss rate as reported by the encoder is |expected_return| for all
 // of them.
@@ skipping 24 matching lines @@
 
   TestSetPacketLossRate(encoder_.get(), I(1.00      , 0.18 + eps), 0.20);
   TestSetPacketLossRate(encoder_.get(), I(0.18 - eps, 0.09 + eps), 0.10);
   TestSetPacketLossRate(encoder_.get(), I(0.09 - eps, 0.04 + eps), 0.05);
   TestSetPacketLossRate(encoder_.get(), I(0.04 - eps, 0.01 + eps), 0.01);
   TestSetPacketLossRate(encoder_.get(), I(0.01 - eps, 0.00      ), 0.00);
   // clang-format on
 }
 
 }  // namespace webrtc