Bug 1835066 - Remove now-valid selector from file_bug416317.xhtml. r=dholbert

Depends on D179271

Differential Revision: https://phabricator.services.mozilla.com/D179685

dom/base/test/file_bug416317.xhtml

@@ -200,7 +200,6 @@
 
     div, { background: red; }
     .5cm { background: red; }
-    foo & address, p { background: red; }
     [*=test] { background: red; }
     [*|*=test] { background: red; }