[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/processing_component.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 13 matching lines @@
 
   virtual int Initialize();
   virtual void SetExtraOptions(const Config& config) {}
   virtual int Destroy();
 
   bool is_component_enabled() const;
 
  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
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_PROCESSING_COMPONENT_H__