Make AudioParameters a class instead of a struct

media/audio/fake_audio_input_stream.cc

Index: media/audio/fake_audio_input_stream.cc
diff --git a/media/audio/fake_audio_input_stream.cc b/media/audio/fake_audio_input_stream.cc
index b9b271ba670187f723a27fdfe614a24d9bd81ce3..7b35cc5aed1871931922993dcd0a3cb923f3f332 100644
--- a/media/audio/fake_audio_input_stream.cc
+++ b/media/audio/fake_audio_input_stream.cc
@@ -16,11 +16,11 @@ AudioInputStream* FakeAudioInputStream::MakeFakeStream(
 
 FakeAudioInputStream::FakeAudioInputStream(const AudioParameters& params)
     : callback_(NULL),
-      buffer_size_((params.channels * params.bits_per_sample *
-                    params.samples_per_packet) / 8),
+      buffer_size_((params.channels() * params.bits_per_sample() *
+                    params.samples_per_packet()) / 8),
       thread_("FakeAudioRecordingThread"),
       callback_interval_(base::TimeDelta::FromMilliseconds(
-          (params.samples_per_packet * 1000) / params.sample_rate)) {
+          (params.samples_per_packet() * 1000) / params.samples_per_second())) {
   // This object is ref counted (so that it can be used with Thread, PostTask)
   // but the caller expects a plain pointer. So we take a reference here and
   // will Release() ourselves in Close().