"Reverting 44988"

tools/dom/src/NodeValidatorBuilder.dart

Index: tools/dom/src/NodeValidatorBuilder.dart
diff --git a/tools/dom/src/NodeValidatorBuilder.dart b/tools/dom/src/NodeValidatorBuilder.dart
index 7ebeb36dd1deb3155d531f19be3b2161c10ffd8f..7789c1b017df9cce1f314b7472a1b0140ca14b0d 100644
--- a/tools/dom/src/NodeValidatorBuilder.dart
+++ b/tools/dom/src/NodeValidatorBuilder.dart
@@ -455,9 +455,8 @@ 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) {