RefCounted types should not have public destructors, delegate cleanup

media/audio/audio_input_controller.h

Index: media/audio/audio_input_controller.h
diff --git a/media/audio/audio_input_controller.h b/media/audio/audio_input_controller.h
index 200e0e435a5f10e5f15668b178975c5b861be347..964d797278b032b9ed75f37835e3d8e3ad393599 100644
--- a/media/audio/audio_input_controller.h
+++ b/media/audio/audio_input_controller.h
@@ -80,12 +80,14 @@ class MEDIA_EXPORT AudioInputController
   // following methods are all called on the audio thread.
   class MEDIA_EXPORT EventHandler {
    public:
-    virtual ~EventHandler() {}
     virtual void OnCreated(AudioInputController* controller) = 0;
     virtual void OnRecording(AudioInputController* controller) = 0;
     virtual void OnError(AudioInputController* controller, int error_code) = 0;
     virtual void OnData(AudioInputController* controller, const uint8* data,
                         uint32 size) = 0;
+
+   protected:
+    virtual ~EventHandler() {}
   };
 
   // A synchronous writer interface used by AudioInputController for