manifest: delete unused dirlog and _newmanifest functions

As part of migrating all manifest functionality out of manifest.manifest, let's
migrate a couple spots off of manifest.dirlog() to use the revlog specific
accessor. Then we can delete manifest.dirlog() and other unused functions.

mercurial/cmdutil.py

@@ -555,7 +555,7 b' def openrevlog(repo, cmd, file_, opts):'
             if 'treemanifest' not in repo.requirements:
                 raise error.Abort(_("--dir can only be used on repos with "
                                    "treemanifest enabled"))
-            dirlog = repo.manifest.dirlog(dir)
+            dirlog = repo.manifestlog._revlog.dirlog(dir)
             if len(dirlog):
                 r = dirlog
         elif mf:

mercurial/manifest.py

@@ -1581,19 +1581,3 b' class manifest(manifestrevlog):'
         self._mancache = util.lrucachedict(cachesize)
         self._treeinmem = usetreemanifest
         super(manifest, self).__init__(opener, dir=dir, dirlogcache=dirlogcache)
-
-    def _newmanifest(self, data=''):
-        if self._treeinmem:
-            return treemanifest(self._dir, data)
-        return manifestdict(data)
-
-    def dirlog(self, dir):
-        """This overrides the base revlog implementation to allow construction
-        'manifest' types instead of manifestrevlog types. This is only needed
-        until we migrate off the 'manifest' type."""
-        if dir:
-            assert self._treeondisk
-        if dir not in self._dirlogcache:
-            self._dirlogcache[dir] = manifest(self.opener, dir,
-                                              self._dirlogcache)
-        return self._dirlogcache[dir]

mercurial/repair.py

@@ -174,7 +174,7 b' def strip(ui, repo, nodelist, backup=Tru'
                     if (unencoded.startswith('meta/') and
                         unencoded.endswith('00manifest.i')):
                         dir = unencoded[5:-12]
-                        repo.manifest.dirlog(dir).strip(striprev, tr)
+                        repo.manifestlog._revlog.dirlog(dir).strip(striprev, tr)
             for fn in files:
                 repo.file(fn).strip(striprev, tr)
             tr.endgroup()