Fixed #26013 -- Moved django.core.urlresolvers to django.urls.

Thanks to Tim Graham for the review.

tests/generic_views/test_base.py

@@ -4,10 +4,10 @@ import time
 import unittest
 
 from django.core.exceptions import ImproperlyConfigured
-from django.core.urlresolvers import resolve
 from django.http import HttpResponse
 from django.test import RequestFactory, SimpleTestCase, override_settings
 from django.test.utils import require_jinja2
+from django.urls import resolve
 from django.views.generic import RedirectView, TemplateView, View
 
 from . import views