Migrated test block 29 to Dart 2.0

tests/corelib/string_trim2_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.
-
-import "package:expect/expect.dart";
-
-const WHITESPACE = const [
-  0x09,
-  0x0A,
-  0x0B,
-  0x0C,
-  0x0D,
-  0x20,
-  0x85,
-  0xA0,
-  0x1680,
-  0x2000,
-  0x2001,
-  0x2002,
-  0x2003,
-  0x2004,
-  0x2005,
-  0x2006,
-  0x2007,
-  0x2008,
-  0x2009,
-  0x200A,
-  0x202F,
-  0x205F,
-  0x3000,
-  0x2028,
-  0x2029,
-  0xFEFF,
-];
-
-main() {
-  for (var ws in WHITESPACE) {
-    var name = ws.toRadixString(16);
-    var c = new String.fromCharCode(ws);
-    Expect.equals("", c.trim(), "$name");
-    Expect.equals("a", ("a" + c).trim(), "a-$name");
-    Expect.equals("a", (c + "a").trim(), "$name-a");
-    Expect.equals("a", (c + c + "a" + c + c).trim(), "$name around");
-    Expect.equals(
-        "a" + c + "a", (c + c + "a" + c + "a" + c + c).trim(), "$name many");
-  }
-  Expect.equals("", new String.fromCharCodes(WHITESPACE).trim(), "ALL");
-}