Include DDC fixes to dart:html in the main version

sdk/lib/svg/dartium/svg_dartium.dart

 /**
  * Scalable Vector Graphics:
  * Two-dimensional vector graphics with support for events and animation.
  *
  * For details about the features and syntax of SVG, a W3C standard,
  * refer to the
  * [Scalable Vector Graphics Specification](http://www.w3.org/TR/SVG/).
  */
 library dart.dom.svg;
 
@@ skipping 5169 matching lines @@
 // BSD-style license that can be found in the LICENSE file.
 
 class AttributeClassSet extends CssClassSetImpl {
   final Element _element;
 
   AttributeClassSet(this._element);
 
   Set<String> readClasses() {
     var classname = _element.attributes['class'];
     if (classname is AnimatedString) {
-      classname = classname.baseVal;
+      classname = (classname as AnimatedString).baseVal;
     }
 
     Set<String> s = new LinkedHashSet<String>();
     if (classname == null) {
       return s;
     }
     for (String name in classname.split(' ')) {
       String trimmed = name.trim();
       if (!trimmed.isEmpty) {
         s.add(trimmed);
@@ skipping 2210 matching lines @@
    * Constructor instantiated by the DOM when a custom element has been created.
    *
    * This can only be called by subclasses from their created constructor.
    */
   _SVGMPathElement.created() : super.created();
 
   // Override these methods for Dartium _SVGMPathElement can't be abstract.
   AnimatedString get href =>
       _blink.BlinkSVGMPathElement.instance.href_Getter_(this);
 }