Revert "Add some support for the code-point code-unit distinction."

tests/corelib/string_trim_unicode_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.
-
-class Range {
-  final int from;
-  final int to;
-  const Range(this.from, this.to);
-}
-
-class StringTrimTest {
-  static testMain() {
-    var spaces = [
-        const Range(9, 13),  // Control characters, not in the Zs category.
-        const Range(32, 32),
-        const Range(0xa0, 0xa0),
-        const Range(0x1680, 0x1680),
-        const Range(0x180e, 0x180e),
-        const Range(0x2000, 0x200a),
-        // LINE SEPARATOR, category Zl and PARAGRAPH SEPARATOR, category Zp.
-        const Range(0x2028, 0x2029),
-        const Range(0x202f, 0x202f),
-        const Range(0x205f, 0x205f),
-        const Range(0x3000, 0x3000),
-        const Range(0xfeff, 0xfeff)];  // Unicode BOM.
-    for (int range in spaces) {
-      for (int i = range.from - 1; i <= range.to + 1; i++) {
-        print("Check $i");
-        if (i >= range.from && i <= range.to) {
-          Expect.equals(
-              new String.fromCharCodes([i, 'f'.charCodeAt(0), i]).trim(), 'f');
-        } else {
-          Expect.isFalse('f' ==
-              new String.fromCharCodes([i, 'f'.charCodeAt(0), i]).trim());
-        }
-      }
-    }
-    // 0x85 NEL Next line is not in the Unicode Zs category and it not special
-    // cased in the ES5 spec either.
-    Expect.isFalse('f' ==
-        new String.fromCharCodes([0x85, 'f'.charCodeAt(0), 0x85]).trim());
-  }
-}
-
-main() {
-  StringTrimTest.testMain();
-}