Convert channel counts to size_t.

webrtc/modules/audio_processing/processing_component.h

Index: webrtc/modules/audio_processing/processing_component.h
diff --git a/webrtc/modules/audio_processing/processing_component.h b/webrtc/modules/audio_processing/processing_component.h
index 291aea39224f496f6cd14a1ef2de958349f987e5..577f1570ad63987a7199a78bcae09cfacd5fa2f5 100644
--- a/webrtc/modules/audio_processing/processing_component.h
+++ b/webrtc/modules/audio_processing/processing_component.h
@@ -47,21 +47,21 @@ class ProcessingComponent {
  protected:
   virtual int Configure();
   int EnableComponent(bool enable);
-  void* handle(int index) const;
-  int num_handles() const;
+  void* handle(size_t index) const;
+  size_t num_handles() const;
 
  private:
   virtual void* CreateHandle() const = 0;
   virtual int InitializeHandle(void* handle) const = 0;
   virtual int ConfigureHandle(void* handle) const = 0;
   virtual void DestroyHandle(void* handle) const = 0;
-  virtual int num_handles_required() const = 0;
+  virtual size_t num_handles_required() const = 0;
   virtual int GetHandleError(void* handle) const = 0;
 
   std::vector<void*> handles_;
   bool initialized_;
   bool enabled_;
-  int num_handles_;
+  size_t num_handles_;
 };
 
 }  // namespace webrtc