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

webrtc/voice_engine/voice_engine_defines.h

Index: webrtc/voice_engine/voice_engine_defines.h
diff --git a/webrtc/voice_engine/voice_engine_defines.h b/webrtc/voice_engine/voice_engine_defines.h
index 6fea6c71c34da074fa2285d0d132c60cf530292b..f78fb2c5589f0a2053eb028d79918676c34bb677 100644
--- a/webrtc/voice_engine/voice_engine_defines.h
+++ b/webrtc/voice_engine/voice_engine_defines.h
@@ -28,7 +28,7 @@ namespace webrtc {
 
 // Internal buffer size required for mono audio, based on the highest sample
 // rate voice engine supports (10 ms of audio at 192 kHz).
-static const int kMaxMonoDataSizeSamples = 1920;
+static const size_t kMaxMonoDataSizeSamples = 1920;
 
 // VolumeControl
 enum { kMinVolumeLevel = 0 };