Make AudioParameters a class instead of a struct

content/test/webrtc_audio_device_test.cc

Index: content/test/webrtc_audio_device_test.cc
diff --git a/content/test/webrtc_audio_device_test.cc b/content/test/webrtc_audio_device_test.cc
index 08f571789e7ffe73777139816345e1be8a2e1ea5..b9a8f348559e2cca825ed1aadd1135742af45bdb 100644
--- a/content/test/webrtc_audio_device_test.cc
+++ b/content/test/webrtc_audio_device_test.cc
@@ -223,11 +223,12 @@ void WebRTCAudioDeviceTest::OnGetHardwareInputSampleRate(double* sample_rate) {
           AudioManagerBase::kDefaultDeviceId) : 0.0;
 }
 
-void WebRTCAudioDeviceTest::OnGetHardwareInputChannelCount(uint32* channels) {
+void WebRTCAudioDeviceTest::OnGetHardwareInputChannelLayout(
+    ChannelLayout* layout) {
   EXPECT_TRUE(audio_util_callback_);
-  *channels = audio_util_callback_ ?
-      audio_util_callback_->GetAudioInputHardwareChannelCount(
-          AudioManagerBase::kDefaultDeviceId) : 0;
+  *layout = audio_util_callback_ ?
+      audio_util_callback_->GetAudioInputHardwareChannelLayout(
+          AudioManagerBase::kDefaultDeviceId) : CHANNEL_LAYOUT_NONE;
 }
 
 // IPC::Channel::Listener implementation.
@@ -262,8 +263,8 @@ bool WebRTCAudioDeviceTest::OnMessageReceived(const IPC::Message& message) {
                         OnGetHardwareSampleRate)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareInputSampleRate,
                         OnGetHardwareInputSampleRate)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareInputChannelCount,
-                        OnGetHardwareInputChannelCount)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareInputChannelLayout,
+                        OnGetHardwareInputChannelLayout)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()