Fix identity and SVGAnimatedString issues with element_classes_test

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

Index: tools/dom/templates/html/impl/impl_Node.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Node.darttemplate b/tools/dom/templates/html/impl/impl_Node.darttemplate
index d871dd37161ee4ab314b539622815be627e994bb..c9330567b9fb5f163a43fe62622867e5b7daf08f 100644
--- a/tools/dom/templates/html/impl/impl_Node.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Node.darttemplate
@@ -114,7 +114,12 @@ $endif
   bool remove(Object object) {
     if (object is! Node) return false;
     Node node = object;
+$if JSINTEROP
+    // We aren't preserving identity of nodes in JSINTEROP mode
+    if (_this != node.parentNode) return false;
+$else
     if (!identical(_this, node.parentNode)) return false;
+$endif
     _this._removeChild(node);
     return true;
   }