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remove dead comment

diff --git a/hgext/obsolete.py b/hgext/obsolete.py
--- a/hgext/obsolete.py
+++ b/hgext/obsolete.py
@@ -115,7 +115,6 @@ context.changectx.obsolete = obsolete
 def revsetobsolete(repo, subset, x):
     """filter obsolet entry"""
     args = revset.getargs(x, 0, 0, 'publicheads takes no arguments')
-    # XXX slow stop using context
     return [r for r in subset if r in repo._obsoleteset and repo._phaserev[r] > 0]
 
 ### Other Extension compat