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

webrtc/modules/audio_processing/splitting_filter.h

Index: webrtc/modules/audio_processing/splitting_filter.h
diff --git a/webrtc/modules/audio_processing/splitting_filter.h b/webrtc/modules/audio_processing/splitting_filter.h
index bc036c3c2a78bf7e28949122ada8a725c6ea5782..51088d5bdf36e390f94856ab4987667cd2189d06 100644
--- a/webrtc/modules/audio_processing/splitting_filter.h
+++ b/webrtc/modules/audio_processing/splitting_filter.h
@@ -45,7 +45,7 @@ struct TwoBandsStates {
 // used.
 class SplittingFilter {
  public:
-  SplittingFilter(int num_channels, int num_bands, int num_frames);
+  SplittingFilter(int num_channels, size_t num_bands, size_t num_frames);
 
   void Analysis(const IFChannelBuffer* data, IFChannelBuffer* bands);
   void Synthesis(const IFChannelBuffer* bands, IFChannelBuffer* data);
@@ -58,7 +58,7 @@ class SplittingFilter {
   void ThreeBandsSynthesis(const IFChannelBuffer* bands, IFChannelBuffer* data);
   void InitBuffers();
 
-  const int num_bands_;
+  const size_t num_bands_;
   std::vector<TwoBandsStates> two_bands_states_;
   ScopedVector<ThreeBandFilterBank> three_band_filter_banks_;
 };