Add methods to Collection.

tools/dom/templates/html/impl/impl_Element.darttemplate

 // 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.
 
 part of html;
 
 // TODO(jacobr): use _Lists.dart to remove some of the duplicated
 // functionality.
 class _ChildrenElementList implements List {
   // Raw Element.
@@ skipping 99 matching lines @@
   }
 
   Element operator [](int index) {
     return _childElements[index];
   }
 
   void operator []=(int index, Element value) {
     _element.$dom_replaceChild(value, _childElements[index]);
   }
 
-   void set length(int newLength) {
-     // TODO(jacobr): remove children when length is reduced.
-     throw new UnsupportedError('');
-   }
+  void set length(int newLength) {
+    // TODO(jacobr): remove children when length is reduced.
+    throw new UnsupportedError('');
+  }
 
   Element add(Element value) {
     _element.$dom_appendChild(value);
     return value;
   }
 
   Element addLast(Element value) => add(value);
 
   Iterator<Element> get iterator => toList().iterator;
 
   void addAll(Iterable<Element> iterable) {
     for (Element element in iterable) {
       _element.$dom_appendChild(element);
     }
   }
 
   void sort([int compare(Element a, Element b)]) {
     throw new UnsupportedError('TODO(jacobr): should we impl?');
   }
 
   dynamic reduce(dynamic initialValue,
       dynamic combine(dynamic previousValue, Element element)) {
     return IterableMixinWorkaround.reduce(this, initialValue, combine);
   }
 
   void setRange(int start, int rangeLength, List from, [int startFrom = 0]) {
     throw new UnimplementedError();
   }
 
+  void remove(Object object) {
+    if (object is Element) {
+      Element element = object;
+      if (identical(element.parentNode, this)) {
+        _element.$dom_removeChild(element);
+      }
+    }
+  }
+
+  void removeAll(Iterable elements) {
+    Collections.removeAll(this, elements);
+  }
+
+  void retainAll(Iterable elements) {
+    Collections.retainAll(this, elements);
+  }
+
+  void removeMatching(bool test(Element element)) {
+    Collections.removeMatching(this, test);
+  }
+
+  void retainMatching(bool test(Element element)) {
+    Collections.retainMatching(this, test);
+  }
+
   void removeRange(int start, int rangeLength) {
     throw new UnimplementedError();
   }
 
   void insertRange(int start, int rangeLength, [initialValue = null]) {
     throw new UnimplementedError();
   }
 
   List getRange(int start, int rangeLength) =>
     new _FrozenElementList._wrap(Lists.getRange(this, start, rangeLength,
@@ skipping 206 matching lines @@
   }
 
   Element removeAt(int index) {
     throw new UnsupportedError('');
   }
 
   Element removeLast() {
     throw new UnsupportedError('');
   }
 
+  void remove(Object element) {
+    throw new UnsupportedError('');
+  }
+
+  void removeAll(Iterable elements) {
+    throw new UnsupportedError('');
+  }
+
+  void retainAll(Iterable elements) {
+    throw new UnsupportedError('');
+  }
+
+  void removeMatching(bool test(Element element)) {
+    throw new UnsupportedError('');
+  }
+
+  void retainMatching(bool test(Element element)) {
+    throw new UnsupportedError('');
+  }
+
   Element get first => _nodeList.first;
 
   Element get last => _nodeList.last;
 
   Element get single => _nodeList.single;
 
   Element min([int compare(Element a, Element b)]) {
     return IterableMixinWorkaround.min(this, compare);
   }
 
@@ skipping 604 matching lines @@
 $if DART2JS
   // Optimization to improve performance until the dart2js compiler inlines this
   // method.
   static dynamic createElement_tag(String tag) =>
       JS('Element', 'document.createElement(#)', tag);
 $else
   static Element createElement_tag(String tag) =>
       document.$dom_createElement(tag);
 $endif
 }