Make String.charCodes a getter.

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 15 matching lines @@
       Expect.equals("wassup!", line);
     } else {
       Expect.fail("More or less than 2 lines read ($linesRead lines read).");
     }
   };
 }
 
 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".charCodes;
   InputStream x = (new File(fileName)).openInputStream();
   var byteCount = 0;
   x.onData = () {
     Expect.equals(expected[byteCount], x.read(1)[0]);
     byteCount++;
   };
   x.onClosed = () {
     Expect.equals(expected.length, byteCount);
   };
 }
@@ skipping 41 matching lines @@
         chunk = x.read();
         Expect.equals(null, chunk);
         done.toSendPort().send(null);
       };
     };
   };
 }
 
 void testUnreadyInputStream() {
   String fileName = getFilename("tests/standalone/io/readuntil_test.dat");
-  var expected = "Hello Dart\nwassup!\n".charCodes();
+  var expected = "Hello Dart\nwassup!\n".charCodes;
   InputStream x = (new File(fileName)).openInputStream();
   List<int> buffer = new List<int>(100);
 
   x.onData = () {
     Expect.fail("Input stream closed before opening called onData handler.");
   };
 
   x.onClosed = () { };
 
   // Called before stream is ready.
   int read = x.readInto(buffer);
   Expect.equals(0, read);
 
   // Called before stream is ready.
   x.close();
 }
 
 
 main() {
   testStringInputStreamSync();
   testInputStreamAsync();
   // 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.
   testStringInputStreamAsync("readline_test1.dat", 111);
   testStringInputStreamAsync("readline_test2.dat", 114);
   testChunkedInputStream();
   testUnreadyInputStream();
 }