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 c46bd421d41ba2e256a92a940a283d0241b93b4e..e604f44df3d1b4164afbe2b84bf1184fa01470e2 100644
--- a/tests/standalone/io/file_input_stream_test.dart
+++ b/tests/standalone/io/file_input_stream_test.dart
@@ -33,7 +33,7 @@ void testStringInputStreamSync() {
 void testInputStreamAsync() {
   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;
   InputStream x = (new File(fileName)).openInputStream();
   var byteCount = 0;
   x.onData = () {
@@ -95,7 +95,7 @@ void testChunkedInputStream() {
 
 void testUnreadyInputStream() {
   String fileName = getFilename("tests/standalone/io/readuntil_test.dat");
-  var expected = "Hello Dart\nwassup!\n".charCodes;
+  var expected = "Hello Dart\nwassup!\n".codeUnits;
   InputStream x = (new File(fileName)).openInputStream();
   List<int> buffer = new List<int>.fixedLength(100);