Removed unnecessary import in django/urls/base.py.

django/urls/base.py

@@ -153,7 +153,6 @@ def is_valid_path(path, urlconf=None):
     False otherwise. This is a convenience method to make working with "is
     this a match?" cases easier, avoiding try...except blocks.
     """
-    from django.urls.base import resolve
     try:
         resolve(path, urlconf)
         return True