Move LicenseMixin into VideoFields class

common/lib/xmodule/xmodule/video_module/video_module.py

@@ -288,7 +288,7 @@ class VideoModule(VideoFields, VideoTranscriptsMixin, VideoStudentViewHandlers,
 
 
 class VideoDescriptor(VideoFields, VideoTranscriptsMixin, VideoStudioViewHandlers,
-                      TabsEditingDescriptor, LicenseMixin, EmptyDataRawDescriptor):
+                      TabsEditingDescriptor, EmptyDataRawDescriptor):
     """
     Descriptor for `VideoModule`.
     """

common/lib/xmodule/xmodule/video_module/video_xfields.py

@@ -6,12 +6,13 @@ import datetime
 from xblock.fields import Scope, String, Float, Boolean, List, Dict
 
 from xmodule.fields import RelativeTime
+from xmodule.mixin import LicenseMixin
 
 # Make '_' a no-op so we can scrape strings
 _ = lambda text: text
 
 
-class VideoFields(object):
+class VideoFields(LicenseMixin):
     """Fields for `VideoModule` and `VideoDescriptor`."""
     display_name = String(
         help=_("The name students see. This name appears in the course ribbon and as a header for the video."),