Move some core classes to collection library.

tests/corelib/collection_from_test.dart

Index: tests/corelib/collection_from_test.dart
diff --git a/tests/corelib/collection_from_test.dart b/tests/corelib/collection_from_test.dart
index 9996a7cee4d057564783882d25846be8f70580f0..75dbe7145820febda65862306e8116af685b5d57 100644
--- a/tests/corelib/collection_from_test.dart
+++ b/tests/corelib/collection_from_test.dart
@@ -2,6 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+library collection.from.test;
+import 'dart:collection' show Queue;
+
 class CollectionFromTest {
   static testMain() {
     var set = new Set<int>();