Utilizing the AEC3 config struct for constants.

webrtc/modules/audio_processing/aec3/echo_remover_metrics_unittest.cc

Index: webrtc/modules/audio_processing/aec3/echo_remover_metrics_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_remover_metrics_unittest.cc b/webrtc/modules/audio_processing/aec3/echo_remover_metrics_unittest.cc
index 21a5af27354c6c30870a4977512298059a1af7c3..094508effa166571d8755fb51e05efb3fe548238 100644
--- a/webrtc/modules/audio_processing/aec3/echo_remover_metrics_unittest.cc
+++ b/webrtc/modules/audio_processing/aec3/echo_remover_metrics_unittest.cc
@@ -126,7 +126,7 @@ TEST(DbMetric, Constructor) {
 // Verify the general functionality of EchoRemoverMetrics.
 TEST(EchoRemoverMetrics, NormalUsage) {
   EchoRemoverMetrics metrics;
-  AecState aec_state(0.f);
+  AecState aec_state(AudioProcessing::Config::EchoCanceller3{});
   std::array<float, kFftLengthBy2Plus1> comfort_noise_spectrum;
   std::array<float, kFftLengthBy2Plus1> suppressor_gain;
   comfort_noise_spectrum.fill(10.f);