Remove old InputStream and OutputStream classes from dart:io.

sdk/lib/io/string_transformer.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 /**
+ * String encodings.
+ */
+class Encoding {
+  static const Encoding UTF_8 = const Encoding._internal("UTF-8");
+  static const Encoding ISO_8859_1 = const Encoding._internal("ISO-8859-1");
+  static const Encoding ASCII = const Encoding._internal("ASCII");
+  /**
+   * SYSTEM encoding is the current code page on Windows and UTF-8 on
+   * Linux and Mac.
+   */
+  static const Encoding SYSTEM = const Encoding._internal("SYSTEM");
+  const Encoding._internal(String this.name);
+  final String name;
+}
+
+
+/**
  * Stream transformer that can decode a stream of bytes into a stream of
  * strings using [encoding].
  *
  * Invalid or forbidden byte-sequences will not produce errors, but will instead
  * insert [replacementChar] in the decoded strings.
  */
 class StringDecoder implements StreamTransformer<List<int>, String> {
   var _decoder;
 
   /**
@@ skipping 370 matching lines @@
       _subscription.resume();
     }
   }
 
   void _subscriptionChanged() {
     if (!_controller.hasSubscribers) {
       _subscription.cancel();
     }
   }
 }