Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

tests/corelib/collection_contains_test.dart

-// Copyright (c) 2012, 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.
-
-import "package:expect/expect.dart";
-
-// Tests for the contains methods on lists.
-
-test(list, notInList) {
-  testList(list) {
-    for (int i = 0; i < list.length; i++) {
-      var elem = list[i];
-      Expect.isTrue(list.contains(list[i]), "$list.contains($elem)");
-    }
-    Expect.isFalse(list.contains(notInList), "!$list.contains($notInList)");
-  }
-  List fixedList = new List(list.length);
-  List growList = new List();
-  for (int i = 0; i < list.length; i++) {
-    fixedList[i] = list[i];
-    growList.add(list[i]);
-  }
-  testList(list);
-  testList(fixedList);
-  testList(growList);
-}
-
-class C {
-  const C();
-}
-
-class Niet {
-  bool operator==(other) => false;
-}
-
-main() {
-  test(const <String>["a", "b", "c", null], "d");
-  test(const <int>[1, 2, 3, null], 0);
-  test(const <bool>[true, false], null);
-  test(const <C>[const C(), const C(), null], new C());
-  test(<C>[new C(), new C(), new C(), null], new C());
-  test(const <double>[ 0.0, 1.0, 5e-324, 1e+308, double.INFINITY ], 2.0);
-  Expect.isTrue(const <double>[-0.0].contains(0.0));
-  Expect.isFalse(const <double>[double.NAN].contains(double.NAN));
-  var niet = new Niet();
-  Expect.isFalse([niet].contains(niet));
-}