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

webrtc/modules/audio_processing/rms_level.cc

Index: webrtc/modules/audio_processing/rms_level.cc
diff --git a/webrtc/modules/audio_processing/rms_level.cc b/webrtc/modules/audio_processing/rms_level.cc
index 14136bf30495dda86c9240b5b8ab03b6e33c4e40..70c4422d34bae2c5f9542162da6b2d98a65f01de 100644
--- a/webrtc/modules/audio_processing/rms_level.cc
+++ b/webrtc/modules/audio_processing/rms_level.cc
@@ -28,14 +28,14 @@ void RMSLevel::Reset() {
   sample_count_ = 0;
 }
 
-void RMSLevel::Process(const int16_t* data, int length) {
-  for (int i = 0; i < length; ++i) {
+void RMSLevel::Process(const int16_t* data, size_t length) {
+  for (size_t i = 0; i < length; ++i) {
     sum_square_ += data[i] * data[i];
   }
   sample_count_ += length;
 }
 
-void RMSLevel::ProcessMuted(int length) {
+void RMSLevel::ProcessMuted(size_t length) {
   sample_count_ += length;
 }