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

webrtc/common_audio/blocker_unittest.cc

 /*
  *  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.
  */
 
 #include "webrtc/common_audio/blocker.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 // Callback Function to add 3 to every sample in the signal.
 class PlusThreeBlockerCallback : public webrtc::BlockerCallback {
  public:
   void ProcessBlock(const float* const* input,
-                    int num_frames,
+                    size_t num_frames,
                     int num_input_channels,
                     int num_output_channels,
                     float* const* output) override {
     for (int i = 0; i < num_output_channels; ++i) {
-      for (int j = 0; j < num_frames; ++j) {
+      for (size_t j = 0; j < num_frames; ++j) {
         output[i][j] = input[i][j] + 3;
       }
     }
   }
 };
 
 // No-op Callback Function.
 class CopyBlockerCallback : public webrtc::BlockerCallback {
  public:
   void ProcessBlock(const float* const* input,
-                    int num_frames,
+                    size_t num_frames,
                     int num_input_channels,
                     int num_output_channels,
                     float* const* output) override {
     for (int i = 0; i < num_output_channels; ++i) {
-      for (int j = 0; j < num_frames; ++j) {
+      for (size_t j = 0; j < num_frames; ++j) {
         output[i][j] = input[i][j];
       }
     }
   }
 };
 
 }  // namespace
 
 namespace webrtc {
 
@@ skipping 280 matching lines @@
             kNumOutputChannels);
 
     ValidateInitialDelay(output_cb.channels(),
                          kNumOutputChannels,
                          kNumFrames,
                          kInitialDelay[i]);
   }
 }
 
 }  // namespace webrtc