Take three of FooList to List<Foo> again.

tests/html/client_rect_test.dart

 #library('ClientRectTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
 
   insertTestDiv() {
     var element = new Element.tag('div');
     element.innerHTML = @'''
     A large block of text should go here. Click this
     block of text multiple times to see each line
     highlight with every click of the mouse button.
     ''';
     document.body.nodes.add(element);
     return element;
   }
 
   useHtmlConfiguration();
 
    test("ClientRectList test", () {
     insertTestDiv();
     var range = document.createRange();
     List<ClientRect> rects = range.getClientRects();
     Expect.isTrue(rects is List<ClientRect>);
   });
 }