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

webrtc/common_audio/fft4g.h

Index: webrtc/common_audio/fft4g.h
diff --git a/webrtc/common_audio/fft4g.h b/webrtc/common_audio/fft4g.h
index 2fe4299ed9deba4b52535b0012335b6960950f63..6dd792f6308e3427af85a528e7597b0e2ecd3fb6 100644
--- a/webrtc/common_audio/fft4g.h
+++ b/webrtc/common_audio/fft4g.h
@@ -16,7 +16,7 @@ extern "C" {
 #endif
 
 // Refer to fft4g.c for documentation.
-void WebRtc_rdft(int n, int isgn, float *a, int *ip, float *w);
+void WebRtc_rdft(size_t n, int isgn, float *a, size_t *ip, float *w);
 
 #if defined(__cplusplus)
 }