Backed out changeset ee5ddcc6ca27 (bug 1352351)

MozReview-Commit-ID: IteCk4NwKCC

testing/mozharness/scripts/web_platform_tests.py

@@ -147,8 +147,7 @@ class WebPlatformTest(TestingMixin, MercurialScript, BlobUploadMixin, CodeCovera
                 "--binary=%s" % self.binary_path,
                 "--symbols-path=%s" % self.query_symbols_url(),
                 "--stackwalk-binary=%s" % self.query_minidump_stackwalk(),
-                "--stackfix-dir=%s" % os.path.join(dirs["abs_test_install_dir"], "bin"),
-                "--run-by-dir=3"]
+                "--stackfix-dir=%s" % os.path.join(dirs["abs_test_install_dir"], "bin")]
 
         for test_type in c.get("test_type", []):
             cmd.append("--test-type=%s" % test_type)