Make AudioParameters a class instead of a struct

media/audio/win/audio_low_latency_output_win.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Implementation of AudioOutputStream for Windows using Windows Core Audio
 // WASAPI for low latency rendering.
 //
 // Overview of operation and performance:
 //
 // - An object of WASAPIAudioOutputStream is created by the AudioManager
 //   factory.
@@ skipping 142 matching lines @@
   // Implementation of AudioOutputStream.
   virtual bool Open() OVERRIDE;
   virtual void Start(AudioSourceCallback* callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void SetVolume(double volume) OVERRIDE;
   virtual void GetVolume(double* volume) OVERRIDE;
 
   // Retrieves the stream format that the audio engine uses for its internal
   // processing/mixing of shared-mode streams.
-  static double HardwareSampleRate(ERole device_role);
+  static int HardwareSampleRate(ERole device_role);
 
   bool started() const { return started_; }
 
  private:
   // Implementation of IUnknown (trivial in this case). See
   // msdn.microsoft.com/en-us/library/windows/desktop/dd371403(v=vs.85).aspx
   // for details regarding why proper implementations of AddRef(), Release()
   // and QueryInterface() are not needed here.
   STDMETHOD_(ULONG, AddRef)();
   STDMETHOD_(ULONG, Release)();
@@ skipping 126 matching lines @@
   // This event will be signaled when rendering shall stop.
   base::win::ScopedHandle stop_render_event_;
 
   // This event will be signaled when stream switching shall take place.
   base::win::ScopedHandle stream_switch_event_;
 
   DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream);
 };
 
 #endif  // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_