"Reverting 44988"

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index bd5a30e4a378e5fd2dc5bb2a8ddddd7e5e959948..a12bb8e7cfd9b64d4078dcc69f2fcb1300d53cc7 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -39640,9 +39640,8 @@ class _SvgNodeValidator implements NodeValidator {
     }
     // Firefox 37 has issues with creating foreign elements inside a
     // foreignobject tag as SvgElement. We don't want foreignobject contents
-    // anyway, so just remove the whole tree outright. And we can't rely
-    // on IE recognizing the SvgForeignObject type, so go by tagName. Bug 23144
-    if (element is svg.SvgElement && element.tagName == 'foreignObject') {
+    // anyway, so just remove the whole tree outright.
+    if (element is svg.ForeignObjectElement) {
       return false;
     }
     if (element is svg.SvgElement) {