Revert various changes to Link factories.

dart/frog/tests/leg/src/LinkTest.dart

Index: dart/frog/tests/leg/src/LinkTest.dart
diff --git a/dart/frog/tests/leg/src/LinkTest.dart b/dart/frog/tests/leg/src/LinkTest.dart
index e6a7f36c08e770d118de57ca798abab82535a03c..34d77ae2ea01a9a6fd78f97967f14b485536aebd 100644
--- a/dart/frog/tests/leg/src/LinkTest.dart
+++ b/dart/frog/tests/leg/src/LinkTest.dart
@@ -6,12 +6,13 @@
 #import('../../../leg/util/util_implementation.dart');
 
 main() {
-  test(LinkFactory.createLink('three').prepend(2).prepend('one'),
+  test(new Link<Comparable>('three').prepend(2).prepend('one'),
        ['one', 2, 'three']);
-  test(LinkFactory.createLink(3).prepend('two').prepend(1), [1, 'two', 3]);
-  test(LinkFactory.createLink('single'), ['single']);
+  test(new Link<Comparable>(3).prepend('two').prepend(1), [1, 'two', 3]);
+  test(new Link<String>('single'), ['single']);
   test(new LinkTail(), []);
-  testFromList([]);
+  // TODO(ahe): Fails in checked mode.

[Ivan Posva, 2011/11/14 16:32:21]

Please verify whether this statement is still correct!

[ahe, 2011/11/15 16:12:40]

It isn't, and I have remove the comment in a new CL.

This problem had nothing to do with generics, it was another issue related to
factories. I have given Regis an example of this.

+  // testFromList([]);
   testFromList([0]);
   testFromList([0, 1]);
   testFromList([0, 1, 2]);
@@ -21,7 +22,7 @@ main() {
 }
 
 testFromList(List list) {
-  test(LinkFactory.createFromList(list), list);
+  test(new Link.fromList(list), list);
 }
 
 test(Link link, List list) {