Update a ton of audio code to use size_t more correctly and in general reduce

webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.h

 /*
  *  Copyright (c) 2014 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 12 matching lines @@
  public:
   // A uniform covariance matrix with a gap at the target location. WARNING:
   // The target angle is assumed to be 0.
   static void UniformCovarianceMatrix(float wave_number,
                                       const std::vector<Point>& geometry,
                                       ComplexMatrix<float>* mat);
 
   // The covariance matrix of a source at the given angle.
   static void AngledCovarianceMatrix(float sound_speed,
                                      float angle,
-                                     int frequency_bin,
-                                     int fft_size,
-                                     int num_freq_bins,
+                                     size_t frequency_bin,
+                                     size_t fft_size,
+                                     size_t num_freq_bins,
                                      int sample_rate,
                                      const std::vector<Point>& geometry,
                                      ComplexMatrix<float>* mat);
 
   // Calculates phase shifts that, when applied to a multichannel signal and
   // added together, cause constructive interferernce for sources located at
   // the given angle.
-  static void PhaseAlignmentMasks(int frequency_bin,
-                                  int fft_size,
+  static void PhaseAlignmentMasks(size_t frequency_bin,
+                                  size_t fft_size,
                                   int sample_rate,
                                   float sound_speed,
                                   const std::vector<Point>& geometry,
                                   float angle,
                                   ComplexMatrix<float>* mat);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BF_HELPERS_H_