Bug 1212398 - Extend timeout value for test_parse_rule.html. r=emilio

Although debug build of Android/arm runs on emulator, test_parse_rule.html
sometimes runs over 5 min. So we should extend timeout value for this.

Differential Revision: https://phabricator.services.mozilla.com/D21663

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

layout/style/test/test_parse_rule.html

@@ -13,6 +13,7 @@
 <div id=a class='a b c' title='zxcv weeqweqeweasd&#13;&#10;a&#10;'></div>
 <script>
 SimpleTest.waitForExplicitFinish();
+SimpleTest.requestLongerTimeout(2);
 
 window.onload=function(){