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

utils/tests/string_encoding/unicode_test.dart

 #!/usr/bin/env 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.
 
 library unicode_tests;
 import 'dunit.dart';
 import '../../../lib/utf/utf.dart';
 
 void main() {
   TestSuite suite = new TestSuite();
   suite.registerTestClass(new UnicodeTests());
   suite.run();
 }
 
 class UnicodeTests extends TestClass {
   static const String testPhrase =
       "The quick brown fox jumps over the lazy dog.";
 
   static const List<int> testCodepoints = const<int> [
       84, 104, 101, 32, 113, 117, 105, 99, 107, 32, 98, 114, 111, 119, 110,
       32, 102, 111, 120, 32, 106, 117, 109, 112, 115, 32, 111, 118, 101, 114,
       32, 116, 104, 101, 32, 108, 97, 122, 121, 32, 100, 111, 103, 46];
 
   void registerTests(TestSuite suite) {
     register("testCodepointsToString", testCodepointsToString, suite);
-    register("testStringCharCodes", testStringCharCodes, suite);
-    register("testEmptyStringFromCharCodes", testEmptyStringFromCharCodes, suite);
-    register("testEmptyStringCharCodes", testEmptyStringCharCodes, suite);
+    register("testStringToCodepoints", testStringToCodepoints, suite);
+    register("testEmptyCodepointsToString", testEmptyCodepointsToString, suite);
+    register("testEmptyStringToCodepoints", testEmptyStringToCodepoints, suite);
   }
 
-  void testStringCharCodes() {
-    Expect.listEquals(testCodepoints, testPhrase.charCodes());
+  void testStringToCodepoints() {
+    Expect.listEquals(testCodepoints, stringToCodepoints(testPhrase));
   }
 
   void testCodepointsToString() {
-    Expect.stringEquals(testPhrase, new String.fromCharCodes(testCodepoints));
+    Expect.stringEquals(testPhrase, codepointsToString(testCodepoints));
   }
 
-  void testEmptyStringFromCharCodes() {
-    Expect.stringEquals("", new String.fromCharCodes(<int>[]));
+  void testEmptyCodepointsToString() {
+    Expect.stringEquals("", codepointsToString(<int>[]));
   }
 
-  void testEmptyStringCharCodes() {
-    Expect.listEquals([], "".charCodes());
+  void testEmptyStringToCodepoints() {
+    Expect.listEquals([], stringToCodepoints(""));
   }
 }