[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc

Index: webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc
diff --git a/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc b/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc
index ed81247aae37159cf3e60fe0b0db90607f64dca2..f888bac35b8c1f0834ebbd1c19276ac2fa2fcde0 100644
--- a/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc
+++ b/webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc
@@ -32,8 +32,8 @@ void CovarianceMatrixGenerator::UniformCovarianceMatrix(
     float wave_number,
     const std::vector<Point>& geometry,
     ComplexMatrix<float>* mat) {
-  CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows());
-  CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
+  CHECK_EQ(geometry.size(), mat->num_rows());
+  CHECK_EQ(geometry.size(), mat->num_columns());
 
   complex<float>* const* mat_els = mat->elements();
   for (size_t i = 0; i < geometry.size(); ++i) {
@@ -57,8 +57,8 @@ void CovarianceMatrixGenerator::AngledCovarianceMatrix(
     int sample_rate,
     const std::vector<Point>& geometry,
     ComplexMatrix<float>* mat) {
-  CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows());
-  CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
+  CHECK_EQ(geometry.size(), mat->num_rows());
+  CHECK_EQ(geometry.size(), mat->num_columns());
 
   ComplexMatrix<float> interf_cov_vector(1, geometry.size());
   ComplexMatrix<float> interf_cov_vector_transposed(geometry.size(), 1);
@@ -82,8 +82,8 @@ void CovarianceMatrixGenerator::PhaseAlignmentMasks(
     const std::vector<Point>& geometry,
     float angle,
     ComplexMatrix<float>* mat) {
-  CHECK_EQ(1, mat->num_rows());
-  CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
+  CHECK_EQ(1u, mat->num_rows());
+  CHECK_EQ(geometry.size(), mat->num_columns());
 
   float freq_in_hertz =
       (static_cast<float>(frequency_bin) / fft_size) * sample_rate;