Update audio code to use size_t more correctly, webrtc/modules/audio_processing/

webrtc/modules/audio_processing/audio_processing_impl.h

Index: webrtc/modules/audio_processing/audio_processing_impl.h
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.h b/webrtc/modules/audio_processing/audio_processing_impl.h
index bbd17191585037e9fa739a1390f5013023a4ba8e..0464fcaee343304f772ec3b9ca6e45d2a0c96577 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.h
+++ b/webrtc/modules/audio_processing/audio_processing_impl.h
@@ -54,15 +54,16 @@ class AudioRate {
 
   void set(int rate) {
     rate_ = rate;
-    samples_per_channel_ = AudioProcessing::kChunkSizeMs * rate_ / 1000;
+    samples_per_channel_ =
+        static_cast<size_t>(AudioProcessing::kChunkSizeMs * rate_ / 1000);
   }
 
   int rate() const { return rate_; }
-  int samples_per_channel() const { return samples_per_channel_; }
+  size_t samples_per_channel() const { return samples_per_channel_; }
 
  private:
   int rate_;
-  int samples_per_channel_;
+  size_t samples_per_channel_;
 };
 
 class AudioFormat : public AudioRate {
@@ -112,7 +113,7 @@ class AudioProcessingImpl : public AudioProcessing {
   bool output_will_be_muted() const override;
   int ProcessStream(AudioFrame* frame) override;
   int ProcessStream(const float* const* src,
-                    int samples_per_channel,
+                    size_t samples_per_channel,
                     int input_sample_rate_hz,
                     ChannelLayout input_layout,
                     int output_sample_rate_hz,
@@ -120,7 +121,7 @@ class AudioProcessingImpl : public AudioProcessing {
                     float* const* dest) override;
   int AnalyzeReverseStream(AudioFrame* frame) override;
   int AnalyzeReverseStream(const float* const* data,
-                           int samples_per_channel,
+                           size_t samples_per_channel,
                            int sample_rate_hz,
                            ChannelLayout layout) override;
   int set_stream_delay_ms(int delay) override;