[lifenews] Use `_proto_relative_url`

diff --git a/youtube_dl/extractor/lifenews.py b/youtube_dl/extractor/lifenews.py
index 963f16e1ab317b652a4c9ed7dc771d98add35a0e..081016b8014afaf210eabe34404b7cd643fb65de 100644 (file)
--- a/youtube_dl/extractor/lifenews.py
+++ b/youtube_dl/extractor/lifenews.py
@@ -99,8 +99,7 @@ class LifeNewsIE(InfoExtractor):
             return cur_info
 
         if iframe_link:
-            if iframe_link.startswith('//'):
-                iframe_link = 'http:' + iframe_link
+            iframe_link = self._proto_relative_url(iframe_link, 'http:')
             cur_info = dict(common_info)
             cur_info.update({
                 '_type': 'url_transparent',