[css-syntax] Remove redundant step from 'consume a url token'. Fixes w3c#3054.

Author: tabatkins

css-syntax-3/Overview.bs

@@ -1217,11 +1217,6 @@ Consume a url token</h4>
 		<li>
 			Consume as much <a>whitespace</a> as possible.
 
-		<li>
-			If the <a>next input code point</a> is EOF,
-			this is a <a>parse error</a>.
-			Return the <<url-token>>.
-
 		<li>
 			Repeatedly consume the <a>next input code point</a> from the stream: