Remove deprecated string features.

tests/language/string_escapes_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 StringEscapesTest {
 
   static testMain() {
     testDelimited();
     testFixed2();
     testFixed4();
     testEscapes();
     testLiteral();
   }
 
   static testDelimited() {
     String str = "Foo\u{1}Bar\u{000001}Baz\u{D7FF}Boo";
     Expect.equals(15, str.length);
-    Expect.equals(1, str.charCodeAt(3));
-    Expect.equals(1, str.charCodeAt(7));
-    Expect.equals(0xD7FF, str.charCodeAt(11));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(12));
+    Expect.equals(1, str.codeUnitAt(3));
+    Expect.equals(1, str.codeUnitAt(7));
+    Expect.equals(0xD7FF, str.codeUnitAt(11));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(12));
   }
 
   static testEscapes() {
     String str = "Foo\fBar\vBaz\bBoo";
     Expect.equals(15, str.length);
-    Expect.equals(12, str.charCodeAt(3));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(4));
-    Expect.equals(11, str.charCodeAt(7));
-    Expect.equals('z'.charCodeAt(0), str.charCodeAt(10));
-    Expect.equals(8, str.charCodeAt(11));
-    Expect.equals('o'.charCodeAt(0), str.charCodeAt(14));
+    Expect.equals(12, str.codeUnitAt(3));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(4));
+    Expect.equals(11, str.codeUnitAt(7));
+    Expect.equals('z'.codeUnitAt(0), str.codeUnitAt(10));
+    Expect.equals(8, str.codeUnitAt(11));
+    Expect.equals('o'.codeUnitAt(0), str.codeUnitAt(14));
     str = "Abc\rDef\nGhi\tJkl";
     Expect.equals(15, str.length);
-    Expect.equals(13, str.charCodeAt(3));
-    Expect.equals('D'.charCodeAt(0), str.charCodeAt(4));
-    Expect.equals(10, str.charCodeAt(7));
-    Expect.equals('G'.charCodeAt(0), str.charCodeAt(8));
-    Expect.equals(9, str.charCodeAt(11));
-    Expect.equals('J'.charCodeAt(0), str.charCodeAt(12));
+    Expect.equals(13, str.codeUnitAt(3));
+    Expect.equals('D'.codeUnitAt(0), str.codeUnitAt(4));
+    Expect.equals(10, str.codeUnitAt(7));
+    Expect.equals('G'.codeUnitAt(0), str.codeUnitAt(8));
+    Expect.equals(9, str.codeUnitAt(11));
+    Expect.equals('J'.codeUnitAt(0), str.codeUnitAt(12));
   }
 
   static testFixed2() {
     String str = "Foo\xFFBar";
     Expect.equals(7, str.length);
-    Expect.equals(255, str.charCodeAt(3));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(4));
+    Expect.equals(255, str.codeUnitAt(3));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(4));
   }
 
   static testFixed4() {
     String str = "Foo\u0001Bar";
     Expect.equals(7, str.length);
-    Expect.equals(1, str.charCodeAt(3));
-    Expect.equals('B'.charCodeAt(0), str.charCodeAt(4));
+    Expect.equals(1, str.codeUnitAt(3));
+    Expect.equals('B'.codeUnitAt(0), str.codeUnitAt(4));
   }
 
   static testLiteral() {
     String str = "\a\c\d\e\g\h\i\j\k\l\$\{\}\"";
     Expect.equals(r'acdeghijkl${}"', str);
   }
 }
 
 main() {
   StringEscapesTest.testMain();
 }