[PATCH 5 of 6 V2] revert: drop the remnant of the prefetchfiles hook

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1518327627 18000
#      Sun Feb 11 00:40:27 2018 -0500
# Node ID d05ecbfd419747d580100f86a3ffdc3b85574166
# Parent  386c98fec8ab751dfa6dc7fd7a83ecc2c5d6815b
revert: drop the remnant of the prefetchfiles hook

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -2871,8 +2871,8 @@
                 _revertprefetch(repo, ctx,
                                 *[actions[name][0] for name in needdata])
             oplist = [actions[name][0] for name in needdata]
-            _prefetchfiles(repo, ctx,
-                           [f for sublist in oplist for f in sublist])
+            fileprefetchhooks(repo, ctx,
+                              [f for sublist in oplist for f in sublist])
             _performrevert(repo, parents, ctx, actions, interactive, tobackup)
 
         if targetsubs:
@@ -2891,11 +2891,6 @@
 
 _revertprefetch = _revertprefetchstub
 
-def _prefetchfiles(repo, ctx, files):
-    """Let extensions changing the storage layer prefetch content for any non
-    merge based command."""
-    fileprefetchhooks(repo, ctx, files)
-
 def _performrevert(repo, parents, ctx, actions, interactive=False,
                    tobackup=None):
     """function that actually perform all the actions computed for revert