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obsolete: remove public revset (it's now expected to be in core)

diff --git a/hgext/obsolete.py b/hgext/obsolete.py
--- a/hgext/obsolete.py
+++ b/hgext/obsolete.py
@@ -111,10 +111,6 @@ context.changectx.obsolete = obsolete
 ### revset
 #############################
 
-def revsetpublic(repo, subset, x):
-    args = revset.getargs(x, 0, 0, 'publicheads takes no arguments')
-    # XXX slow stop using context
-    return [r for r in subset if repo._phaserev[r] == 0]
 
 def revsetobsolete(repo, subset, x):
     """filter obsolet entry"""
@@ -170,7 +166,6 @@ def filterobsoleteout(orig, repo, remote
 def extsetup(ui):
 
     revset.symbols["obsolete"] = revsetobsolete
-    revset.symbols["public"] = revsetpublic
 
     extensions.wrapfunction(discovery, 'findcommonoutgoing', filterobsoleteout)