Bug 1363982 - Fix missing directories in moz.build, a=bustage on a CLOSED TREE

MozReview-Commit-ID: 1aGV5hth8sT

testing/web-platform/moz.build

@@ -150,9 +150,6 @@ with Files("tests/selection/**"):
 with Files("tests/selectors/**"):
     BUG_COMPONENT = ("Core", "DOM")
 
-with Files("tests/selectors-api/**"):
-    BUG_COMPONENT = ("Core", "DOM")
-
 with Files("tests/service-workers/**"):
     BUG_COMPONENT = ("Core", "DOM: Service Workers")