[soundcloud] Remove unused _IPHONE_CLIENT_ID

youtube_dl/extractor/soundcloud.py

@@ -158,7 +158,6 @@ class SoundcloudIE(InfoExtractor):
     ]
 
     _CLIENT_ID = 'DQskPX1pntALRzMp4HSxya3Mc0AO66Ro'
-    _IPHONE_CLIENT_ID = '376f225bf427445fc4bfb6b99b72e0bf'
 
     @staticmethod
     def _extract_urls(webpage):