Fix typo parameter name.

tools/dom/src/shared_html.dart

 // Copyright (c) 2013, 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.
 
 part of dart.dom.html;
 
 _wrapZone(callback) {
   // For performance reasons avoid wrapping if we are in the root zone.
   if (Zone.current == Zone.ROOT) return callback;
   return Zone.current.bindUnaryCallback(callback, runGuarded: true);
@@ skipping 12 matching lines @@
 @Experimental()
 Element query(String relativeSelectors) => document.query(relativeSelectors);
 /**
  * Alias for [querySelectorAll]. Note this function is deprecated because its
  * semantics will be changing in the future.
  */
 @deprecated
 @Experimental()
 ElementList queryAll(String relativeSelectors) => document.queryAll(relativeSelectors);
 
-Element querySelector(String selector) => document.querySelector(selector);
-ElementList querySelectorAll(String selector) => document.querySelectorAll(selector);
+Element querySelector(String selectors) => document.querySelector(selectors);
+ElementList querySelectorAll(String selectors) => document.querySelectorAll(selectors);