Roll 50: Updated for push to origin/master.

tools/dom/src/dartium_CssClassSet.dart

Index: tools/dom/src/dartium_CssClassSet.dart
diff --git a/tools/dom/src/dartium_CssClassSet.dart b/tools/dom/src/dartium_CssClassSet.dart
index 868cc57cfc2e4ab18e065c1d62ea56d8ac64a759..e483c376229c67ee9516407a9b0fe9275f3be18a 100644
--- a/tools/dom/src/dartium_CssClassSet.dart
+++ b/tools/dom/src/dartium_CssClassSet.dart
@@ -73,6 +73,9 @@ class _ElementCssClassSet extends CssClassSetImpl {
   Set<String> readClasses() {
     var s = new LinkedHashSet<String>();
     var classname = _element.className;
+    if (classname is svg.AnimatedString) {
+      classname = classname.baseVal;
+    }
 
     for (String name in classname.split(' ')) {
       String trimmed = name.trim();