[css-cascade-3] invalid rule handling already tested in CSS2 (by me, apparently)

Author: fantasai

css-cascade-3/implementation-report.html

@@ -274,5 +274,4 @@ <h2 id=missing>
 		<li>Media queries + @import
 		<li>Animation overrides author styles
 		<li>all shorthand vs. unicode-bidi
-		<li>@import after invalid rules
 	</ul>