Fix imports

youtube_dl/extractor/br.py

@@ -4,6 +4,7 @@ from __future__ import unicode_literals
 import re
 
 from .common import InfoExtractor
+from ..utils import ExtractorError
 
 
 class BRIE(InfoExtractor):

youtube_dl/extractor/trutube.py

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

youtube_dl/extractor/youtube.py

@@ -29,7 +29,6 @@ from ..utils import (
     ExtractorError,
     int_or_none,
     PagedList,
-    RegexNotFoundError,
     unescapeHTML,
     unified_strdate,
     orderedSet,