Bug 1323645 - Enable custom element HTMLConstructor chrome test for Android. r=edgar

Differential Revision: https://phabricator.services.mozilla.com/D153116

dom/tests/mochitest/webcomponents/chrome.ini

@@ -3,7 +3,6 @@ support-files =
   dummy_page.html
 
 [test_custom_element_htmlconstructor_chrome.html]
-skip-if = os == 'android' # bug 1323645
 support-files =
   htmlconstructor_autonomous_tests.js
   htmlconstructor_builtin_tests.js