[DBAL-590] Remove Column#visit(). The table is responsible for this, because of dependencies.

lib/Doctrine/DBAL/Schema/Column.php

@@ -463,14 +463,6 @@ class Column extends AbstractAsset
         return $this->_customSchemaOptions;
     }
 
-    /**
-     * @param \Doctrine\DBAL\Schema\Visitor\Visitor $visitor
-     */
-    public function visit(Visitor $visitor)
-    {
-        $visitor->accept($this);
-    }
-
     /**
      * @return array
      */