Final cleanup pass over audio device API

extensions/browser/api/audio/audio_service.cc

Index: extensions/browser/api/audio/audio_service.cc
diff --git a/extensions/browser/api/audio/audio_service.cc b/extensions/browser/api/audio/audio_service.cc
index bdc1ea697c37a0acf88dd30e91209797304fc35a..6bce28479d1fc571fe274d3b86c883da58025faf 100644
--- a/extensions/browser/api/audio/audio_service.cc
+++ b/extensions/browser/api/audio/audio_service.cc
@@ -17,6 +17,8 @@ class AudioServiceImpl : public AudioService {
 
   // Start to query audio device information.
   bool GetInfo(OutputInfo* output_info_out, InputInfo* input_info_out) override;
+  bool GetDevices(const api::audio::DeviceFilter* filter,
+                  DeviceInfoList* devices_out) override;
   void SetActiveDevices(const DeviceIdList& device_list) override;
   bool SetActiveDeviceLists(
       const std::unique_ptr<DeviceIdList>& input_devices,
@@ -47,6 +49,11 @@ bool AudioServiceImpl::GetInfo(OutputInfo* output_info_out,
   return false;
 }
 
+bool AudioServiceImpl::GetDevices(const api::audio::DeviceFilter* filter,
+                                  DeviceInfoList* devices_out) {
+  return false;
+}
+
 bool AudioServiceImpl::SetActiveDeviceLists(
     const std::unique_ptr<DeviceIdList>& input_devices,
     const std::unique_ptr<DeviceIdList>& output_devives) {