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 f1284f1acb3f412c1c805092c723d348557020a3..0e4bb61e379addbd7b9cf7477712d47333959517 100644
--- a/media/audio/fake_audio_input_stream.cc
+++ b/media/audio/fake_audio_input_stream.cc
@@ -20,11 +20,11 @@ FakeAudioInputStream::FakeAudioInputStream(AudioManagerBase* manager,
                                            const AudioParameters& params)
     : audio_manager_(manager),
       callback_(NULL),
-      buffer_size_((params.channels * params.bits_per_sample *
-                    params.samples_per_packet) / 8),
+      buffer_size_((params.channels() * params.bits_per_sample() *
+                    params.frames_per_buffer()) / 8),
       thread_("FakeAudioRecordingThread"),
       callback_interval_(base::TimeDelta::FromMilliseconds(
-          (params.samples_per_packet * 1000) / params.sample_rate)) {
+          (params.frames_per_buffer() * 1000) / params.sample_rate())) {
 }
 
 FakeAudioInputStream::~FakeAudioInputStream() {}