Remove deprecated string features.

sdk/lib/io/string_stream.dart

Index: sdk/lib/io/string_stream.dart
diff --git a/sdk/lib/io/string_stream.dart b/sdk/lib/io/string_stream.dart
index cd38e2cb3c14c15102c070c5ea9a7c002a8b23d7..a6893cba45f2c206aca1986823071812900c0e02 100644
--- a/sdk/lib/io/string_stream.dart
+++ b/sdk/lib/io/string_stream.dart
@@ -300,7 +300,7 @@ class _WindowsCodePageDecoder extends _StringDecoderBase {
   // Process the next chunk of data.
   bool _processNext() {
     List<int> bytes = _bufferList.readBytes(_bufferList.length);
-    for (var charCode in _decodeBytes(bytes).charCodes) {
+    for (var charCode in _decodeBytes(bytes).codeUnits) {
       addChar(charCode);
     }
     return true;
@@ -344,10 +344,10 @@ class _Latin1Encoder implements _StringEncoder {
   List<int> encodeString(String string) {
     List<int> result = new Uint8List(string.length);
     for (int i = 0; i < string.length; i++) {
-      int charCode = string.charCodeAt(i);
+      int charCode = string.codeUnitAt(i);
       if (charCode > 255) {
         throw new EncoderException(
-            "No ISO_8859_1 encoding for code point $charCode");
+            "No ISO_8859_1 encoding for code unit $charCode");
       }
       result[i] = charCode;
     }
@@ -361,10 +361,10 @@ class _AsciiEncoder implements _StringEncoder {
   List<int> encodeString(String string) {
     List<int> result = new Uint8List(string.length);
     for (int i = 0; i < string.length; i++) {
-      int charCode = string.charCodeAt(i);
+      int charCode = string.codeUnitAt(i);
       if (charCode > 127) {
         throw new EncoderException(
-            "No ASCII encoding for code point $charCode");
+            "No ASCII encoding for code unit $charCode");
       }
       result[i] = charCode;
     }