Make AudioParameters a class instead of a struct

content/renderer/media/audio_input_device.h

Index: content/renderer/media/audio_input_device.h
diff --git a/content/renderer/media/audio_input_device.h b/content/renderer/media/audio_input_device.h
index ea60c3bd2818ab998265e21a9b325d67fa791328..e015ff6c44c8628ad9150f58c8dba762347ccc19 100644
--- a/content/renderer/media/audio_input_device.h
+++ b/content/renderer/media/audio_input_device.h
@@ -116,10 +116,7 @@ class CONTENT_EXPORT AudioInputDevice
   };
 
   // Methods called on main render thread -------------------------------------
-  AudioInputDevice(size_t buffer_size,
-                   int channels,
-                   double sample_rate,
-                   CaptureCallback* callback,
+  AudioInputDevice(const AudioParameters& params, CaptureCallback* callback,
                    CaptureEventHandler* event_handler);
   virtual ~AudioInputDevice();
 
@@ -144,8 +141,11 @@ class CONTENT_EXPORT AudioInputDevice
   // Returns |true| on success.
   bool GetVolume(double* volume);
 
-  double sample_rate() const { return audio_parameters_.sample_rate; }
-  size_t buffer_size() const { return audio_parameters_.samples_per_packet; }
+  double samples_per_second() const {
+    return audio_parameters_.samples_per_second();
+  }
+
+  size_t buffer_size() const { return audio_parameters_.samples_per_packet(); }
 
   // Methods called on IO thread ----------------------------------------------
   // AudioInputMessageFilter::Delegate impl., called by AudioInputMessageFilter