Remove deprecated string features.

tests/standalone/io/file_input_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.
 // Testing file input stream, VM-only, standalone test.
 
 import "dart:io";
 import "dart:isolate";
 
 // Helper method to be able to run the test from the runtime
 // directory, or the top directory.
@@ skipping 18 matching lines @@
       Expect.fail("More or less than 2 lines read ($linesRead lines read).");
     }
   });
 }
 
 
 void testOpenStreamAsync() {
   var keepAlive = new ReceivePort();
   String fileName = getFilename("tests/standalone/io/readuntil_test.dat");
   // File contains "Hello Dart\nwassup!\n"
-  var expected = "Hello Dart\nwassup!\n".charCodes;
+  var expected = "Hello Dart\nwassup!\n".codeUnits;
   var byteCount = 0;
   (new File(fileName)).openRead().listen(
       (d) => byteCount += d.length,
       onDone: () {
         Expect.equals(expected.length, byteCount);
         keepAlive.close();
       });
 }
 
 
@@ skipping 38 matching lines @@
       },
       onDone: () {
         Expect.isTrue(streamedBytes > 0 && streamedBytes <= originalLength);
         temp.delete(recursive: true).then((_) => keepAlive.close());
       },
       onError: (e) {
         Expect.fail("Unexpected error");
       });
 }
 
-
 void testInputStreamDelete() {
   var keepAlive = new ReceivePort();
   var temp = new Directory('').createTempSync();
   var file = new File('${temp.path}/input_stream_delete.txt');
   var originalLength = writeLongFileSync(file);
   // Start streaming the file. Pause after first chunk. Truncate
   // underlying file and check that the streaming stops with or
   // without getting all data.
   var streamedBytes = 0;
   var subscription;
@@ skipping 88 matching lines @@
   testOpenStreamAsync();
   testInputStreamTruncate();
   testInputStreamDelete();
   testInputStreamAppend();
   // Check the length of these files as both are text files where one
   // is without a terminating line separator which can easily be added
   // back if accidentally opened in a text editor.
   testStringLineTransformerEnding("readline_test1.dat", 111);
   testStringLineTransformerEnding("readline_test2.dat", 114);
 }