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

pkg/collection/test/equality_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 equality utilities.
 
 import "dart:collection";
-import "package:collection_helpers/all.dart";
+import "package:collection/collection.dart";
 import "package:unittest/unittest.dart";
 
 main() {
   test("IterableEquality - List", () {
     var l1 = [1, 2, 3, 4, 5];
     var l2 = [1.0, 2.0, 3.0, 4.0, 5.0];
     expect(const IterableEquality().equals(l1, l2), isTrue);
     Equality iterId = const IterableEquality(const IdentityEquality());
     expect(iterId.equals(l1, l2), isFalse);  /// 01: ok
   });
@@ skipping 136 matching lines @@
     expect(colleq.equals(map1a, map2a),
         isTrue);
     expect(colleq.equals(map1b, map2b),
         isTrue);
     expect(colleq.equals(l1, l2),
         isTrue);
     expect(colleq.equals(s1, s2),
         isTrue);
   });
 }