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

talk/app/webrtc/mediastreaminterface.h

Index: talk/app/webrtc/mediastreaminterface.h
diff --git a/talk/app/webrtc/mediastreaminterface.h b/talk/app/webrtc/mediastreaminterface.h
index 4de06488a79e6ffd172d7d3d2d984f4565b46094..ceca99b243420edd44b9721f324d9f807b491819 100644
--- a/talk/app/webrtc/mediastreaminterface.h
+++ b/talk/app/webrtc/mediastreaminterface.h
@@ -187,7 +187,7 @@ class AudioTrackSinkInterface {
                       int bits_per_sample,
                       int sample_rate,
                       int number_of_channels,
-                      int number_of_frames) = 0;
+                      size_t number_of_frames) = 0;
  protected:
   virtual ~AudioTrackSinkInterface() {}
 };