CssClassSet upgrade

tools/dom/src/dartium_CssClassSet.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2015, 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 html;
 
-/** A Set that stores the CSS class names for an element. */
-abstract class CssClassSet implements Set<String> {
-
-  /**
-   * Adds the class [value] to the element if it is not on it, removes it if it
-   * is.
-   *
-   * If [shouldAdd] is true, then we always add that [value] to the element. If
-   * [shouldAdd] is false then we always remove [value] from the element.
-   */
-  bool toggle(String value, [bool shouldAdd]);
-
-  /**
-   * Returns [:true:] if classes cannot be added or removed from this
-   * [:CssClassSet:].
-   */
-  bool get frozen;
-
-  /**
-   * Determine if this element contains the class [value].
-   *
-   * This is the Dart equivalent of jQuery's
-   * [hasClass](http://api.jquery.com/hasClass/).
-   */
-  bool contains(String value);
-
-  /**
-   * Add the class [value] to element.
-   *
-   * This is the Dart equivalent of jQuery's
-   * [addClass](http://api.jquery.com/addClass/).
-   *
-   * If this corresponds to one element. Returns true if [value] was added to
-   * the set, otherwise false.
-   *
-   * If this corresponds to many elements, null is always returned.
-   */
-  bool add(String value);
-
-  /**
-   * Remove the class [value] from element, and return true on successful
-   * removal.
-   *
-   * This is the Dart equivalent of jQuery's
-   * [removeClass](http://api.jquery.com/removeClass/).
-   */
-  bool remove(Object value);
-
-  /**
-   * Add all classes specified in [iterable] to element.
-   *
-   * This is the Dart equivalent of jQuery's
-   * [addClass](http://api.jquery.com/addClass/).
-   */
-  void addAll(Iterable<String> iterable);
-
-  /**
-   * Remove all classes specified in [iterable] from element.
-   *
-   * This is the Dart equivalent of jQuery's
-   * [removeClass](http://api.jquery.com/removeClass/).
-   */
-  void removeAll(Iterable<String> iterable);
-
-  /**
-   * Toggles all classes specified in [iterable] on element.
-   *
-   * Iterate through [iterable]'s items, and add it if it is not on it, or
-   * remove it if it is. This is the Dart equivalent of jQuery's
-   * [toggleClass](http://api.jquery.com/toggleClass/).
-   * If [shouldAdd] is true, then we always add all the classes in [iterable]
-   * element. If [shouldAdd] is false then we always remove all the classes in
-   * [iterable] from the element.
-   */
-  void toggleAll(Iterable<String> iterable, [bool shouldAdd]);
-}
-
 /**
  * A set (union) of the CSS classes that are present in a set of elements.
  * Implemented separately from _ElementCssClassSet for performance.
  */
 class _MultiElementCssClassSet extends CssClassSetImpl {
   final Iterable<Element> _elementIterable;
   Iterable<_ElementCssClassSet> _elementCssClassSetIterable;
 
   _MultiElementCssClassSet(this._elementIterable) {
     _elementCssClassSetIterable = new List.from(_elementIterable).map(
@@ skipping 63 matching lines @@
         s.add(trimmed);
       }
     }
     return s;
   }
 
   void writeClasses(Set<String> s) {
     _element.className = s.join(' ');
   }
 }