Final cleanup pass over audio device API

extensions/browser/api/audio/audio_api.h

Index: extensions/browser/api/audio/audio_api.h
diff --git a/extensions/browser/api/audio/audio_api.h b/extensions/browser/api/audio/audio_api.h
index f4d09ede772faf36f22ed40ec9748f1b6b44d8b4..0e176e2e51b157ddc94396044ce687946650e776 100644
--- a/extensions/browser/api/audio/audio_api.h
+++ b/extensions/browser/api/audio/audio_api.h
@@ -50,6 +50,15 @@ class AudioGetInfoFunction : public UIThreadExtensionFunction {
   ResponseAction Run() override;
 };
 
+class AudioGetDevicesFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("audio.getDevices", AUDIO_GETDEVICES);
+
+ protected:
+  ~AudioGetDevicesFunction() override {}
+  ResponseAction Run() override;
+};
+
 class AudioSetActiveDevicesFunction : public UIThreadExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("audio.setActiveDevices", AUDIO_SETACTIVEDEVICES);