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

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index d32863c3f4d365afddcdcba7100236433d79eb29..43bdeb84737a64242c0993dc4b9787709e46258b 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -431,7 +431,7 @@ public:
     // does not go through transmit_mixer and APM.
     void Demultiplex(const int16_t* audio_data,
                      int sample_rate,
-                     int number_of_frames,
+                     size_t number_of_frames,
                      int number_of_channels);
     uint32_t PrepareEncodeAndSend(int mixingFrequency);
     uint32_t EncodeAndSend();