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

webrtc/modules/audio_processing/aec3/adaptive_fir_filter.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 489 matching lines @@
       aec3::UpdateErlEstimator(H2_, &erl_);
   }
 }
 
 // Constrains the a partiton of the frequency domain filter to be limited in
 // time via setting the relevant time-domain coefficients to zero.
 void AdaptiveFirFilter::Constrain() {
   std::array<float, kFftLength> h;
   fft_.Ifft(H_[partition_to_constrain_], &h);
 
-  const float kScale = 1.0f / kFftLengthBy2;
+  static constexpr float kScale = 1.0f / kFftLengthBy2;
   std::for_each(h.begin(), h.begin() + kFftLengthBy2,
-                [kScale](float& a) { a *= kScale; });
+                [](float& a) { a *= kScale; });
   std::fill(h.begin() + kFftLengthBy2, h.end(), 0.f);
 
   std::copy(h.begin(), h.begin() + kFftLengthBy2,
             h_.begin() + partition_to_constrain_ * kFftLengthBy2);
 
   fft_.Fft(&h, &H_[partition_to_constrain_]);
 
   partition_to_constrain_ = partition_to_constrain_ < (H_.size() - 1)
                                 ? partition_to_constrain_ + 1
                                 : 0;
 }
 
 }  // namespace webrtc