use app.url_for as template global

avoid extra call from helpers.url_for
update changelog for method moves

CHANGES.rst

@@ -8,6 +8,7 @@ Unreleased
 -   Add new customization points to the ``Flask`` app object for many
     previously global behaviors.
 
+    -   ``flask.url_for`` will call ``app.url_for``. :issue:`4568`
     -   ``flask.abort`` will call ``app.aborter``.
         ``Flask.aborter_class`` and ``Flask.make_aborter`` can be used
         to customize this aborter. :issue:`4567`

src/flask/app.py

@@ -45,7 +45,6 @@ from .helpers import get_env
 from .helpers import get_flashed_messages
 from .helpers import get_load_dotenv
 from .helpers import locked_cached_property
-from .helpers import url_for
 from .json import jsonify
 from .logging import create_logger
 from .scaffold import _endpoint_from_view_func
@@ -439,6 +438,7 @@ class Flask(Scaffold):
         #: to raise HTTP errors, and can be called directly as well.
         #:
         #: .. versionadded:: 2.2
+        #:     Moved from ``flask.abort``, which calls this object.
         self.aborter = self.make_aborter()
 
         #: A list of functions that are called by
@@ -727,7 +727,7 @@ class Flask(Scaffold):
 
         rv = self.jinja_environment(self, **options)
         rv.globals.update(
-            url_for=url_for,
+            url_for=self.url_for,
             get_flashed_messages=get_flashed_messages,
             config=self.config,
             # request, session and g are normally added with the
@@ -1798,6 +1798,7 @@ class Flask(Scaffold):
         :param code: The status code for the redirect.
 
         .. versionadded:: 2.2
+            Moved from ``flask.redirect``, which calls this method.
         """
         return _wz_redirect(location, code=code, Response=self.response_class)