Cleanup to make tests agnostic to the modulestore being used.

cms/djangoapps/contentstore/features/grading.py

@@ -5,7 +5,6 @@ from lettuce import world, step
 from common import *
 from terrain.steps import reload_the_page
 from selenium.common.exceptions import InvalidElementStateException
-from opaque_keys.edx.locations import SlashSeparatedCourseKey
 from contentstore.utils import reverse_course_url
 from nose.tools import assert_in, assert_not_in, assert_equal, assert_not_equal  # pylint: disable=no-name-in-module