Fix places that trigger no-unused-lambda-capture

webrtc/modules/audio_processing/aec3/residual_echo_estimator.cc

Index: webrtc/modules/audio_processing/aec3/residual_echo_estimator.cc
diff --git a/webrtc/modules/audio_processing/aec3/residual_echo_estimator.cc b/webrtc/modules/audio_processing/aec3/residual_echo_estimator.cc
index 61208118c7aeacb586e00711cab6b36f82dccead..f3b310657dbc81ca4ed778c884ab732cc628ca36 100644
--- a/webrtc/modules/audio_processing/aec3/residual_echo_estimator.cc
+++ b/webrtc/modules/audio_processing/aec3/residual_echo_estimator.cc
@@ -32,7 +32,7 @@ void EchoGeneratingPower(const RenderBuffer& render_buffer,
   }
 
   // Apply soft noise gate of -78 dBFS.
-  constexpr float kNoiseGatePower = 27509.42f;
+  const float kNoiseGatePower = 27509.42f;
   std::for_each(X2->begin(), X2->end(), [kNoiseGatePower](float& a) {
     if (kNoiseGatePower > a) {
       a = std::max(0.f, a - 0.3f * (kNoiseGatePower - a));