Bug 881978 - Make WebVTTLoadListener callbacks private. r=rillian

WebVTTLoadListener::OnParsedCue() and WebVTTLoadListener::OnReportError() are
for private use and should not be exposed publicly.

content/media/WebVTTLoadListener.h

@@ -60,8 +60,7 @@ class WebVTTLoadListener MOZ_FINAL : public nsIStreamListener,
 public:
   WebVTTLoadListener(HTMLTrackElement* aElement);
   ~WebVTTLoadListener();
-  void OnParsedCue(webvtt_cue* aCue);
-  int OnReportError(uint32_t aLine, uint32_t aCol, webvtt_error aError);
+
   // Loads the libwebvtt parser. Must call this function in order to the
   // WebVTTLoadListener to be ready to accept data.
   nsresult LoadResource();
@@ -74,6 +73,9 @@ private:
   nsRefPtr<HTMLTrackElement> mElement;
   nsAutoRef<webvtt_parser_t> mParser;
 
+  void OnParsedCue(webvtt_cue* aCue);
+  int OnReportError(uint32_t aLine, uint32_t aCol, webvtt_error aError);
+
   static void WEBVTT_CALLBACK OnParsedCueWebVTTCallBack(void* aUserData,
                                                         webvtt_cue* aCue);
   static int WEBVTT_CALLBACK OnReportErrorWebVTTCallBack(void* aUserData,