narrow: drop support for remote expansion (BC) Previous patches to validate narrow patterns accidentically dropped support for the include: syntax that allows patterns to be expanded from a remote. This feature was never implemented in core and is only implemented on Google's custom server. Per @martinvonz's review comment in D4522, it is OK to drop this feature since it isn't used. The concept of this feature does seem useful. I anticipate it making a comeback some day in some shape or form. But for now, let's jettison the dead code. Differential Revision: https://phab.mercurial-scm.org/D4530

--- a/mercurial/narrowspec.py	Fri Sep 07 18:35:54 2018 -0700
+++ b/mercurial/narrowspec.py	Tue Sep 11 15:53:12 2018 -0700
@@ -146,9 +146,6 @@
     return matchmod.match(root, '', [], include=include or [],
                           exclude=exclude or [])
 
-def needsexpansion(includes):
-    return [i for i in includes if i.startswith('include:')]
-
 def load(repo):
     try:
         spec = repo.svfs.read(FILENAME)