Removing dart:html APIs which were deprecated in M2.

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

 // Copyright (c) 2011, 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 svg;
 
 class _AttributeClassSet extends CssClassSet {
   final Element _element;
 
   _AttributeClassSet(this._element);
@@ skipping 27 matching lines @@
       _$(CLASSNAME)FactoryProvider.create$(CLASSNAME)_svg(svg);
 
   _AttributeClassSet _cssClassSet;
   CssClassSet get classes {
     if (_cssClassSet == null) {
       _cssClassSet = new _AttributeClassSet(this);
     }
     return _cssClassSet;
   }
 
-  @deprecated
-  List<Element> get elements => new FilteredElementList(this);
-
-  @deprecated
-  void set elements(Collection<Element> value) {
-    final elements = this.elements;
-    elements.clear();
-    elements.addAll(value);
-  }
-
   List<Element> get children => new FilteredElementList(this);
 
   void set children(List<Element> value) {
     final children = this.children;
     children.clear();
     children.addAll(value);
   }
 
   String get outerHtml {
     final container = new Element.tag("div");
@@ skipping 38 matching lines @@
     throw new UnsupportedError("Cannot get dom_children on SVG.");
   }
 
   bool get isContentEditable => false;
   void click() {
     throw new UnsupportedError("Cannot invoke click SVG.");
   }
 
 $!MEMBERS
 }