Make sure the result is floating point in InitLowFrequencyCorrectionRanges.

webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc

Index: webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc
diff --git a/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc b/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc
index 425ffa0e0b45750e391ddfa8be28a0bc5adc9484..de49965c913c5630435dc9fff4edca9b2b3f814b 100644
--- a/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc
+++ b/webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc
@@ -267,8 +267,10 @@ void NonlinearBeamformer::Initialize(int chunk_size_ms, int sample_rate_hz) {
 //             low_mean_end_bin_       high_mean_end_bin_
 //
 void NonlinearBeamformer::InitLowFrequencyCorrectionRanges() {
-  low_mean_start_bin_ = Round(kLowMeanStartHz * kFftSize / sample_rate_hz_);
-  low_mean_end_bin_ = Round(kLowMeanEndHz * kFftSize / sample_rate_hz_);
+  low_mean_start_bin_ = Round(static_cast<float>(kLowMeanStartHz) *
+                                  kFftSize / sample_rate_hz_);
+  low_mean_end_bin_ = Round(static_cast<float>(kLowMeanEndHz) *
+                                  kFftSize / sample_rate_hz_);
 
   RTC_DCHECK_GT(low_mean_start_bin_, 0U);
   RTC_DCHECK_LT(low_mean_start_bin_, low_mean_end_bin_);