Correctly ignore whitespace in the rule mode, so we don't prematurely generate style rules.

Author: tabatkins

css3-syntax/Overview.html

@@ -2257,6 +2257,10 @@ <h4 id=rule-mode><span class=secno>3.6.4. </span> <dfn id=rule-mode0>Rule
   <p>Consume the <a href="#next-input-token"><i>next input token</i></a>.
 
   <dl>
+   <dt>whitespace token
+
+   <dd> Do nothing, and remain in this state.
+
    <dt>} token
 
    <dd> <a href="#pop-the-current-rule0"><i>Pop the current rule</i></a>. <a

css3-syntax/Overview.src.html

@@ -2274,7 +2274,12 @@ <h4>
 
 	<p>Consume the <i>next input token</i>.
 
-	<dl>		
+	<dl>
+		<dt>whitespace token
+		<dd>
+			Do nothing,
+			and remain in this state.
+			
 		<dt>} token
 		<dd>
 			<i>Pop the current rule</i>.