Remove deprecated string features.

tests/standalone/io/file_input_stream_test.dart

Index: tests/standalone/io/file_input_stream_test.dart
diff --git a/tests/standalone/io/file_input_stream_test.dart b/tests/standalone/io/file_input_stream_test.dart
index 4e2e2c41f550049dce81567b870ab5f9639412a1..e9de0c5eea182a79522b711a5d312e49649ca355 100644
--- a/tests/standalone/io/file_input_stream_test.dart
+++ b/tests/standalone/io/file_input_stream_test.dart
@@ -36,7 +36,7 @@ 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,
@@ -95,7 +95,6 @@ void testInputStreamTruncate() {
       });
 }
 
-
 void testInputStreamDelete() {
   var keepAlive = new ReceivePort();
   var temp = new Directory('').createTempSync();