Fix places that trigger no-unused-lambda-capture - change to using static-constexpr

webrtc/modules/audio_processing/aec3/residual_echo_estimator.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.
  */
 
@@ skipping 14 matching lines @@
                          size_t max_delay,
                          std::array<float, kFftLengthBy2Plus1>* X2) {
   X2->fill(0.f);
   for (size_t k = min_delay; k <= max_delay; ++k) {
     std::transform(X2->begin(), X2->end(), render_buffer.Spectrum(k).begin(),
                    X2->begin(),
                    [](float a, float b) { return std::max(a, b); });
   }
 
   // Apply soft noise gate of -78 dBFS.
-  const float kNoiseGatePower = 27509.42f;
-  std::for_each(X2->begin(), X2->end(), [kNoiseGatePower](float& a) {
+  static constexpr float kNoiseGatePower = 27509.42f;
+  std::for_each(X2->begin(), X2->end(), [](float& a) {
     if (kNoiseGatePower > a) {
       a = std::max(0.f, a - 0.3f * (kNoiseGatePower - a));
     }
   });
 }
 
 constexpr int kNoiseFloorCounterMax = 50;
 constexpr float kNoiseFloorMin = 10.f * 10.f * 128.f * 128.f;
 
 // Updates estimate for the power of the stationary noise component in the
@@ skipping 205 matching lines @@
   } else {
     std::copy(S2.begin(), S2.end(), S2_old_[S2_old_index_].begin());
   }
 
   // Add the power of the echo reverb to the residual echo power.
   std::transform(R2->begin(), R2->end(), R2_reverb_.begin(), R2->begin(),
                  std::plus<float>());
 }
 
 }  // namespace webrtc