Make IDL Callbacks non-refcounted by default

Source/modules/mediastream/NavigatorUserMediaSuccessCallback.h

Index: Source/modules/mediastream/NavigatorUserMediaSuccessCallback.h
diff --git a/Source/modules/mediastream/NavigatorUserMediaSuccessCallback.h b/Source/modules/mediastream/NavigatorUserMediaSuccessCallback.h
index ff84233bf0d558adec0d2f7d10e9e2e9dd7129d9..790031cedb7599d2c526d59ad9b1a7bdf16e4fa7 100644
--- a/Source/modules/mediastream/NavigatorUserMediaSuccessCallback.h
+++ b/Source/modules/mediastream/NavigatorUserMediaSuccessCallback.h
@@ -25,13 +25,11 @@
 #ifndef NavigatorUserMediaSuccessCallback_h
 #define NavigatorUserMediaSuccessCallback_h
 
-#include "wtf/RefCounted.h"
-
 namespace WebCore {
 
 class MediaStream;
 
-class NavigatorUserMediaSuccessCallback : public RefCounted<NavigatorUserMediaSuccessCallback> {
+class NavigatorUserMediaSuccessCallback {
 public:
     virtual ~NavigatorUserMediaSuccessCallback() { }
     virtual bool handleEvent(MediaStream*) = 0;