Fixed another dart2js code emitting error and enabled tests that now work

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

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index 1c1426892d45bb247b55ace84badbb0ad9daa071..180a0b9d1d74456e31dd68b8e1f564cee61d412d 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -821,8 +821,12 @@ $(ANNOTATIONS)$(NATIVESPEC)class $CLASSNAME$EXTENDS$IMPLEMENTS {
     }
     var convertedFrames = frames;
     if (convertedFrames is Iterable) {
+$if DART2JS
+      convertedFrames = frames.map(convertDartToNative_Dictionary).toList();
+$else
       convertedFrames = convertDartToNative_List(
           frames.map(convertDartToNative_Dictionary).toList());
+$endif
     }
     var convertedTiming = timing;
     if (convertedTiming is Map) {