Update audio code to use size_t more correctly, webrtc/common_audio/ portion.

webrtc/common_audio/vad/vad_filterbank.h

Index: webrtc/common_audio/vad/vad_filterbank.h
diff --git a/webrtc/common_audio/vad/vad_filterbank.h b/webrtc/common_audio/vad/vad_filterbank.h
index e9195e5e37dee850215fc3f0f2ec583422a91572..42bf3fc331bee1e4b92a930d8c806e0906e6dfa2 100644
--- a/webrtc/common_audio/vad/vad_filterbank.h
+++ b/webrtc/common_audio/vad/vad_filterbank.h
@@ -39,6 +39,6 @@
 // - returns            : Total energy of the signal (NOTE! This value is not
 //                        exact. It is only used in a comparison.)
 int16_t WebRtcVad_CalculateFeatures(VadInstT* self, const int16_t* data_in,
-                                    int data_length, int16_t* features);
+                                    size_t data_length, int16_t* features);
 
 #endif  // WEBRTC_COMMON_AUDIO_VAD_VAD_FILTERBANK_H_