Unify list.

lib/compiler/implementation/lib/mockimpl.dart

Index: lib/compiler/implementation/lib/mockimpl.dart
diff --git a/lib/compiler/implementation/lib/mockimpl.dart b/lib/compiler/implementation/lib/mockimpl.dart
index e3484cc7084cb31deb9c8b087178725221e2ac4a..2a24529fe692ece1cf494cf7e8501673150e27e2 100644
--- a/lib/compiler/implementation/lib/mockimpl.dart
+++ b/lib/compiler/implementation/lib/mockimpl.dart
@@ -56,16 +56,3 @@ class StringBase {
     return array;
   }
 }
-
-class ListFactory<E> {
-  factory List([int length]) => Primitives.newList(length);
-  factory List.from(Iterable<E> other) {
-    List<E> result = new List<E>();
-    // TODO(ahe): Use for-in when it is implemented correctly.
-    Iterator<E> iterator = other.iterator();
-    while (iterator.hasNext()) {
-      result.add(iterator.next());
-    }
-    return result;
-  }
-}