No need to store invalid media queries.

Source/core/css/CSSGrammar.y.in

Index: Source/core/css/CSSGrammar.y.in
diff --git a/Source/core/css/CSSGrammar.y.in b/Source/core/css/CSSGrammar.y.in
index 8908341a37a703342d5213d4593813ddb7b94386..7e8d4ecdffb586471b8555f0251fd9dcab23c495 100644
--- a/Source/core/css/CSSGrammar.y.in
+++ b/Source/core/css/CSSGrammar.y.in
@@ -566,6 +566,8 @@ media_query_exp:
     '(' maybe_space IDENT maybe_space maybe_media_value closing_parenthesis maybe_space {
         parser->tokenToLowerCase($3);
         $$ = parser->createFloatingMediaQueryExp($3, $5);
+        if (!$$)
+            YYERROR;
     }
     | '(' error error_recovery closing_parenthesis {
         YYERROR;