Remove deprecated string features.

tests/standalone/io/string_stream_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 "dart:io";
 import "dart:isolate";
 
 void testUtf8() {
   List<int> data = [0x01,
                     0x7f,
@@ skipping 86 matching lines @@
     }
   }
 
   void streamClosed() {
     Expect.equals(true, stream.closed);
     Expect.equals(2, stage);
   }
 
   stream.onData = stringData;
   stream.onClosed = streamClosed;
-  s.write("Line".charCodes);
+  s.write("Line".codeUnits);
 }
 
 void testReadLine2() {
   ListInputStream s = new ListInputStream();
   StringInputStream stream = new StringInputStream(s);
   var stage = 0;
 
   void stringData() {
     var line;
     if (stage == 0) {
       Expect.equals(21, stream.available());
       line = stream.readLine();
       Expect.equals("Line1", line);
       Expect.equals(15, stream.available());
       line = stream.readLine();
       Expect.equals("Line2", line);
       Expect.equals(8, stream.available());
       line = stream.readLine();
       Expect.equals("Line3", line);
       line = stream.readLine();
       Expect.equals(2, stream.available());
       Expect.equals(null, line);
       stage++;
-      s.write("ne4\n".charCodes);
+      s.write("ne4\n".codeUnits);
     } else if (stage == 1) {
       Expect.equals(6, stream.available());
       line = stream.readLine();
       Expect.equals("Line4", line);
       Expect.equals(0, stream.available());
       line = stream.readLine();
       Expect.equals(null, line);
       stage++;
-      s.write("\n\n\r\n\r\n\r\r".charCodes);
+      s.write("\n\n\r\n\r\n\r\r".codeUnits);
     } else if (stage == 2) {
       // Expect 5 empty lines. As long as the stream is not closed the
       // final \r cannot be interpreted as a end of line.
       Expect.equals(8, stream.available());
       for (int i = 0; i < 5; i++) {
         line = stream.readLine();
         Expect.equals("", line);
       }
       Expect.equals(1, stream.available());
       line = stream.readLine();
@@ skipping 11 matching lines @@
     }
   }
 
   void streamClosed() {
     Expect.equals(4, stage);
     Expect.equals(true, stream.closed);
   }
 
   stream.onLine = stringData;
   stream.onClosed = streamClosed;
-  s.write("Line1\nLine2\r\nLine3\rLi".charCodes);
+  s.write("Line1\nLine2\r\nLine3\rLi".codeUnits);
 }
 
 void testReadChunks() {
   ListInputStream s = new ListInputStream();
   StringInputStream stream = new StringInputStream(s);
 
   void stringData() {
     var data;
     Expect.equals(8, stream.available());
     data = stream.read(1);
@@ skipping 15 matching lines @@
     Expect.equals(null, data);
     Expect.equals(0, stream.available());
     data = stream.read(3);
     Expect.equals(null, data);
     Expect.equals(0, stream.available());
     data = stream.read();
     Expect.equals(null, data);
     Expect.equals(0, stream.available());
   }
 
-  s.write("ABCD1234".charCodes);
+  s.write("ABCD1234".codeUnits);
   stream.onData = stringData;
 }
 
 void testReadMixed() {
   ListInputStream s = new ListInputStream();
   StringInputStream stream = new StringInputStream(s);
   var stage = 0;
 
   void stringData() {
     var data;
     if (stage == 0) {
       Expect.equals(11, stream.available());
       data = stream.read(2);
       Expect.equals("A\r", data);
       Expect.equals(9, stream.available());
       data = stream.readLine();
       Expect.equals("", data);
       Expect.equals(8, stream.available());
       data = stream.read(4);
       Expect.equals("BCD\n", data);
       Expect.equals(4, stream.available());
       data = stream.readLine();
       Expect.equals(null, data);
       data = stream.read(4);
       Expect.equals("1234", data);
-      s.write("A\r\nBCD\n1234".charCodes);
+      s.write("A\r\nBCD\n1234".codeUnits);
       stage++;
     } else if (stage == 1) {
       Expect.equals(11, stream.available());
       data = stream.read(1);
       Expect.equals("A", data);
       Expect.equals(10, stream.available());
       data = stream.read(1);
       Expect.equals("\r", data);
       Expect.equals(9, stream.available());
       data = stream.read(1);
       Expect.equals("\n", data);
       Expect.equals(8, stream.available());
       data = stream.readLine();
       Expect.equals("BCD", data);
       data = stream.readLine();
       Expect.equals(null, data);
       data = stream.read(4);
       Expect.equals("1234", data);
-      s.write("A\r\nBCD\n1234".charCodes);
+      s.write("A\r\nBCD\n1234".codeUnits);
       stage++;
     } else if (stage == 2) {
       Expect.equals(11, stream.available());
       data = stream.read(7);
       Expect.equals("A\r\nBCD\n", data);
       Expect.equals(4, stream.available());
       data = stream.readLine();
       Expect.equals(null, data);
       data = stream.read();
       Expect.equals("1234", data);
       stage++;
       s.markEndOfStream();
     }
   }
 
   void streamClosed() {
     Expect.equals(3, stage);
     Expect.equals(true, stream.closed);
   }
 
-  s.write("A\r\nBCD\n1234".charCodes);
+  s.write("A\r\nBCD\n1234".codeUnits);
   stream.onData = stringData;
   stream.onClosed = streamClosed;
 }
 
 class TestException implements Exception {
   TestException();
 }
 
 class ErrorInputStream implements InputStream {
   ErrorInputStream();
@@ skipping 41 matching lines @@
   testUtf8();
   testLatin1();
   testAscii();
   testReadLine1();
   testReadLine2();
   testReadChunks();
   testReadMixed();
   testErrorHandler();
   testEncodingErrorWithHandler();
 }