Remove unused imports

youtube_dl/extractor/ntv.py

@@ -5,7 +5,6 @@ import re
 
 from .common import InfoExtractor
 from ..utils import (
-    ExtractorError,
     unescapeHTML
 )
 

youtube_dl/extractor/slutload.py

@@ -3,9 +3,6 @@ from __future__ import unicode_literals
 import re
 
 from .common import InfoExtractor
-from ..utils import (
-    ExtractorError,
-)
 
 
 class SlutloadIE(InfoExtractor):

youtube_dl/extractor/soundcloud.py

@@ -1,7 +1,6 @@
 # encoding: utf-8
 from __future__ import unicode_literals
 
-import json
 import re
 import itertools