Take three of FooList to List<Foo> again.

tests/html/svg_3_test.dart

Index: tests/html/svg_3_test.dart
===================================================================
--- tests/html/svg_3_test.dart	(revision 12595)
+++ tests/html/svg_3_test.dart	(working copy)
@@ -28,11 +28,11 @@
   checkSVGTests(e) {
     // Just check that the operations seem to exist.
     var rx = e.requiredExtensions;
-    Expect.isTrue(rx is SVGStringList);
+    Expect.isTrue(rx is List<String>);
     var rf = e.requiredFeatures;
-    Expect.isTrue(rf is SVGStringList);
+    Expect.isTrue(rf is List<String>);
     var sl = e.systemLanguage;
-    Expect.isTrue(sl is SVGStringList);
+    Expect.isTrue(sl is List<String>);
 
     bool hasDoDo = e.hasExtension("DoDo");
     Expect.isFalse(hasDoDo);