Backed out changeset d064a79bb88b (bug 1410242)

testing/web-platform/meta/shadow-dom/historical.html.ini

@@ -1,5 +1,4 @@
 [historical.html]
-  disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1410242
   [element.createShadowRoot should not exist]
     expected:
       if debug and not stylo and e10s and (os == "win") and (version == "6.1.7601") and (processor == "x86") and (bits == 32): FAIL