largefiles: cleanup import, now that we can assume > 1.9 for bundled extension

hgext/largefiles/lfutil.py

@@ -14,14 +14,9 b' import shutil'
 import stat
 import hashlib
 
-from mercurial import dirstate, httpconnection, match as match_, util
+from mercurial import dirstate, httpconnection, match as match_, util, scmutil
 from mercurial.i18n import _
 
-try:
-    from mercurial import scmutil
-except ImportError:
-    pass
-
 shortname = '.hglf'
 longname = 'largefiles'