widening: remove unused "heads" argument

Differential Revision: https://phab.mercurial-scm.org/D7096

hgext/narrow/narrowbundle2.py

@@ -120,7 +120,6 b' def generate_ellipses_bundle2_for_wideni'
     newexclude,
     version,
     common,
-    heads,
     known,
     depth,
 ):
@@ -132,7 +131,6 b' def generate_ellipses_bundle2_for_wideni'
         if depth < 1:
             raise error.Abort(_(b'depth must be positive, got %d') % depth)
 
-    heads = set(heads or repo.heads())
     common = set(common or [nullid])
     # Steps:
     # 1. Send kill for "$known & ::common"

hgext/narrow/narrowwirepeer.py

@@ -129,7 +129,6 b' def narrow_widen('
                 newexcludes,
                 cgversion,
                 common,
-                list(common),
                 known,
                 None,
             )