Update includes for webrtc/{base => rtc_base} rename (1/3)

webrtc/modules/audio_processing/aec3/decimator_by_4.cc

 /*
  *  Copyright (c) 2017 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.
  */
 #include "webrtc/modules/audio_processing/aec3/decimator_by_4.h"
 
-#include "webrtc/base/checks.h"
+#include "webrtc/rtc_base/checks.h"
 
 namespace webrtc {
 namespace {
 
 // [B,A] = butter(2,1500/16000) which are the same as [B,A] =
 // butter(2,750/8000).
 const CascadedBiQuadFilter::BiQuadCoefficients kLowPassFilterCoefficients = {
     {0.0179f, 0.0357f, 0.0179f},
     {-1.5879f, 0.6594f}};
 
@@ skipping 12 matching lines @@
   low_pass_filter_.Process(in, x);
 
   // Downsample the signal.
   for (size_t j = 0, k = 0; j < out.size(); ++j, k += 4) {
     RTC_DCHECK_GT(kBlockSize, k);
     out[j] = x[k];
   }
 }
 
 }  // namespace webrtc