Create associated packages for the dart:collection and dart:async libs.

pkg/collection/test/wrapper_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 /// Tests wrapper utilities.
 
 import "dart:collection";
-import "package:collection_helpers/all.dart";
+import "package:collection/collection.dart";
 import "package:unittest/unittest.dart";
 
 // Test that any member access/call on the wrapper object is equal to
 // an expected access on the wrapped object.
 // This is implemented by capturing accesses using noSuchMethod and comparing
 // them to expected accesses captured previously.
 
 // Compare two Invocations for having equal type and arguments.
 void testInvocations(Invocation i1, Invocation i2) {
   String name = "${i1.memberName}";
@@ skipping 227 matching lines @@
   });
 
   test("Queue", () {
     testQueue(new QueueExpector());
   });
 
   test("Map", () {
     testMap(new MapExpector());
   });
 }