wireproto: remove unused proto argument from supportedcompengines (API)

In theory, the protocol should be passed to this function. But the
argument isn't being used and it is getting in the way of refactoring.
So let's remove it. We can always add it back later if we need it
again.

Differential Revision: https://phab.mercurial-scm.org/D2086

mercurial/wireproto.py

@@ -587,7 +587,7 b' def bundle1allowed(repo, action):'
 
     return ui.configbool('server', 'bundle1')
 
-def supportedcompengines(ui, proto, role):
+def supportedcompengines(ui, role):
     """Obtain the list of supported compression engines for a request."""
     assert role in (util.CLIENTROLE, util.SERVERROLE)
 
@@ -824,7 +824,7 b' def _capabilities(repo, proto):'
         # FUTURE advertise minrx and mintx after consulting config option
         caps.append('httpmediatype=0.1rx,0.1tx,0.2tx')
 
-        compengines = supportedcompengines(repo.ui, proto, util.SERVERROLE)
+        compengines = supportedcompengines(repo.ui, util.SERVERROLE)
         if compengines:
             comptypes = ','.join(urlreq.quote(e.wireprotosupport().name)
                                  for e in compengines)

mercurial/wireprotoserver.py

@@ -192,7 +192,7 b' class webproto(baseprotocolhandler):'
                     break
 
             # Now find an agreed upon compression format.
-            for engine in wireproto.supportedcompengines(self._ui, self,
+            for engine in wireproto.supportedcompengines(self._ui,
                                                          util.SERVERROLE):
                 if engine.wireprotosupport().name in compformats:
                     opts = {}