Fixed a typo that broke tests.

tools/dom/scripts/dartmetadata.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality to provide Dart metadata for
 DOM APIs.
 """
 
 import copy
@@ skipping 383 matching lines @@
   'DOMWindow.webkitConvertPointFromPageToNode': _webkit_experimental_annotations,
   'DOMWindow.indexedDB': _indexed_db_annotations,
   'DOMWindow.openDatabase': _web_sql_annotations,
   'DOMWindow.performance': _performance_annotations,
   'DOMWindow.webkitNotifications': _webkit_experimental_annotations,
   'DOMWindow.webkitRequestFileSystem': _file_system_annotations,
   'DOMWindow.webkitResolveLocalFileSystemURL': _file_system_annotations,
   'Element.ontransitionend': _all_but_ie9_annotations,
   # Placeholder to add experimental flag, implementation for this is
   # pending in a separate CL.
-  'Element.webkitMatchesSelector': ['@Experimental()()'],
+  'Element.webkitMatchesSelector': ['@Experimental()'],
   'Element.webkitCreateShadowRoot': [
     "@SupportedBrowser(SupportedBrowser.CHROME, '25')",
     "@Experimental()",
   ],
   'Event.clipboardData': _webkit_experimental_annotations,
   'FormData': _all_but_ie9_annotations,
   'HashChangeEvent': [
     "@SupportedBrowser(SupportedBrowser.CHROME)",
     "@SupportedBrowser(SupportedBrowser.FIREFOX)",
     "@SupportedBrowser(SupportedBrowser.SAFARI)",
@@ skipping 337 matching lines @@
       pass
     else:
       _logger.warn('Unknown support_level - %s:%s' % (interface_id, member_id))
 
     return annotations
 
   def Flush(self):
     json_file = open(self._api_status_path, 'w+')
     json.dump(self._types, json_file, indent=2, separators=(',', ': '), sort_keys=True)
     json_file.close()