--- a/mercurial/revlog.py	Fri Sep 21 18:47:04 2018 -0700
+++ b/mercurial/revlog.py	Mon Sep 24 09:59:19 2018 -0700
@@ -2294,87 +2294,6 @@
             res.append(self.datafile)
         return res
 
-    def emitrevisiondeltas(self, requests):
-        frev = self.rev
-
-        prevrev = None
-        for request in requests:
-            node = request.node
-            rev = frev(node)
-
-            if prevrev is None:
-                prevrev = self.index[rev][5]
-
-            # Requesting a full revision.
-            if request.basenode == nullid:
-                baserev = nullrev
-            # Requesting an explicit revision.
-            elif request.basenode is not None:
-                baserev = frev(request.basenode)
-            # Allowing us to choose.
-            else:
-                p1rev, p2rev = self.parentrevs(rev)
-                deltaparentrev = self.deltaparent(rev)
-
-                # Avoid sending full revisions when delta parent is null. Pick
-                # prev in that case. It's tempting to pick p1 in this case, as
-                # p1 will be smaller in the common case. However, computing a
-                # delta against p1 may require resolving the raw text of p1,
-                # which could be expensive. The revlog caches should have prev
-                # cached, meaning less CPU for delta generation. There is
-                # likely room to add a flag and/or config option to control this
-                # behavior.
-                if deltaparentrev == nullrev and self._storedeltachains:
-                    baserev = prevrev
-
-                # Revlog is configured to use full snapshot for a reason.
-                # Stick to full snapshot.
-                elif deltaparentrev == nullrev:
-                    baserev = nullrev
-
-                # Pick previous when we can't be sure the base is available
-                # on consumer.
-                elif deltaparentrev not in (p1rev, p2rev, prevrev):
-                    baserev = prevrev
-                else:
-                    baserev = deltaparentrev
-
-                if baserev != nullrev and not self.candelta(baserev, rev):
-                    baserev = nullrev
-
-            revision = None
-            delta = None
-            baserevisionsize = None
-
-            if self.iscensored(baserev) or self.iscensored(rev):
-                try:
-                    revision = self.revision(node, raw=True)
-                except error.CensoredNodeError as e:
-                    revision = e.tombstone
-
-                if baserev != nullrev:
-                    baserevisionsize = self.rawsize(baserev)
-
-            elif baserev == nullrev:
-                revision = self.revision(node, raw=True)
-            else:
-                delta = self.revdiff(baserev, rev)
-
-            extraflags = REVIDX_ELLIPSIS if request.ellipsis else 0
-
-            yield revlogrevisiondelta(
-                node=node,
-                p1node=request.p1node,
-                p2node=request.p2node,
-                linknode=request.linknode,
-                basenode=self.node(baserev),
-                flags=self.flags(rev) | extraflags,
-                baserevisionsize=baserevisionsize,
-                revision=revision,
-                delta=delta)
-
-            prevrev = rev
-
     def emitrevisions(self, nodes, nodesorder=None, revisiondata=False,
                       assumehaveparentrevisions=False, deltaprevious=False):
         if nodesorder not in ('nodes', 'storage', None):