Update audio code to use size_t more correctly, webrtc/ portion.

webrtc/system_wrappers/interface/aligned_array.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.
  */
 
 #ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_ARRAY_
 #define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_ARRAY_
 
 #include "webrtc/base/checks.h"
 #include "webrtc/system_wrappers/interface/aligned_malloc.h"
 
 namespace webrtc {
 
 // Wrapper class for aligned arrays. Every row (and the first dimension) are
 // aligned to the given byte alignment.
 template<typename T> class AlignedArray {
  public:
-  AlignedArray(int rows, int cols, int alignment)
+  AlignedArray(int rows, size_t cols, int alignment)
       : rows_(rows),
         cols_(cols),
         alignment_(alignment) {
     CHECK_GT(alignment_, 0);
     head_row_ = static_cast<T**>(AlignedMalloc(rows_ * sizeof(*head_row_),
                                                alignment_));
     for (int i = 0; i < rows_; ++i) {
       head_row_[i] = static_cast<T*>(AlignedMalloc(cols_ * sizeof(**head_row_),
                                                    alignment_));
     }
@@ skipping 17 matching lines @@
   T* Row(int row) {
     CHECK_LE(row, rows_);
     return head_row_[row];
   }
 
   const T* Row(int row) const {
     CHECK_LE(row, rows_);
     return head_row_[row];
   }
 
-  T& At(int row, int col) {
+  T& At(int row, size_t col) {
     CHECK_LE(col, cols_);
     return Row(row)[col];
   }
 
-  const T& At(int row, int col) const {
+  const T& At(int row, size_t col) const {
     CHECK_LE(col, cols_);
     return Row(row)[col];
   }
 
   int rows() const {
     return rows_;
   }
 
-  int cols() const {
+  size_t cols() const {
     return cols_;
   }
 
  private:
   int rows_;
-  int cols_;
+  size_t cols_;
   int alignment_;
   T** head_row_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_ARRAY_