[CssSelector] fixed exception namespace

src/Symfony/Component/CssSelector/Tokenizer.php

@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\CssSelector;
 
+use Symfony\Component\CssSelector\Exception\ParseException;
+
 /**
  * Tokenizer lexes a CSS Selector to tokens.
  *
@@ -189,7 +191,7 @@ class Tokenizer
         $matchStart = $match[0][1];
 
         if ($matchStart == $pos) {
-            throw new Exception\ParseException(sprintf('Unexpected symbol: %s at %s', $s[$pos], $pos));
+            throw new ParseException(sprintf('Unexpected symbol: %s at %s', $s[$pos], $pos));
         }
 
         $result = substr($s, $start, $matchStart - $start);