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

webrtc/modules/audio_processing/test/performance_timer.cc

 /*
  *  Copyright (c) 2016 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/test/performance_timer.h"
 
 #include <math.h>
 
 #include <numeric>
 
-#include "webrtc/rtc_base/checks.h"
+#include "webrtc/base/checks.h"
 
 namespace webrtc {
 namespace test {
 
 PerformanceTimer::PerformanceTimer(int num_frames_to_process)
     : clock_(webrtc::Clock::GetRealTimeClock()) {
   timestamps_us_.reserve(num_frames_to_process);
 }
 
 PerformanceTimer::~PerformanceTimer() = default;
@@ skipping 38 matching lines @@
       timestamps_us_.begin() + number_of_warmup_samples, timestamps_us_.end(),
       0.0, [average_duration](const double& a, const int64_t& b) {
         return a + (b - average_duration) * (b - average_duration);
       });
 
   return sqrt(variance / number_of_samples);
 }
 
 }  // namespace test
 }  // namespace webrtc