Update the streams interfaces

runtime/bin/process_impl.dart

 // Copyright (c) 2011, 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.
 
 class _ProcessStartStatus {
   int _errorCode;  // Set to OS error code if process start failed.
   String _errorMessage;  // Set to OS error message if process start failed.
 }
 
 
@@ skipping 63 matching lines @@
   bool _start(String path,
               List<String> arguments,
               Socket input,
               Socket output,
               Socket error,
               Socket exitHandler,
               _ProcessStartStatus status) native "Process_Start";
 
   void _processExit(int pid) native "Process_Exit";
 
-  InputStream get stdoutStream() {
+  InputStream2 get stdoutStream() {
     if (_closed) {
       throw new ProcessException("Process closed");
     }
-    return _in.inputStream;
+    return _in.inputStream2;
   }
 
-  InputStream get stderrStream() {
+  InputStream2 get stderrStream() {
     if (_closed) {
       throw new ProcessException("Process closed");
     }
-    return _err.inputStream;
+    return _err.inputStream2;
   }
 
   OutputStream get stdinStream() {
     if (_closed) {
       throw new ProcessException("Process closed");
     }
     return _out.outputStream;
   }
 
   bool kill() {
@@ skipping 38 matching lines @@
   Socket _in;
   Socket _out;
   Socket _err;
   Socket _exitHandler;
   int _pid;
   bool _closed;
   bool _killed;
   bool _started;
   var _exitHandlerCallback;
 }