Bug 1613025 - Use run_info instead of metadata_path, to get web-platform inside OBJDIR. r=jgraham

Differential Revision: https://phabricator.services.mozilla.com/D61526

--HG--
extra : moz-landing-system : lando

js/src/tests/jstests.py

@@ -380,7 +380,7 @@ def load_wpt_tests(xul_tester, requested_paths, excluded_paths, update_manifest=
                 yield item_type, path, tests
 
     run_info_extras = products.load_product(kwargs["config"], "firefox")[-1](**kwargs)
-    run_info = wpttest.get_run_info(kwargs["test_paths"]["/"]["metadata_path"],
+    run_info = wpttest.get_run_info(kwargs["run_info"],
                                     "firefox",
                                     debug=xul_tester.test("isDebugBuild"),
                                     extras=run_info_extras)