Remove .writeStream, .consume and rewrite IOSink to correctly implement a (sane) well-defined behav…

sdk/lib/io/process.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;
 
 // TODO(ager): The only reason for this class is that we
 // cannot patch a top-level at this point.
 class _ProcessUtils {
   external static _exit(int status);
@@ skipping 97 matching lines @@
    * non-interactive.
    */
   Stream<List<int>> get stderr;
 
   /**
    * Returns the standard input stream of the process as an [IOSink].
    *
    * Throws an [UnsupportedError] if the process is
    * non-interactive.
    */
-  IOSink<Process> get stdin;
+  IOSink get stdin;
 
   /**
    * Returns a [:Future:] which completes with the exit code of the process
    * when the process completes.
    *
    * Throws an [UnsupportedError] if the process is
    * non-interactive.
    */
   Future<int> exitCode;
 
@@ skipping 145 matching lines @@
   /**
    * Contains the system message for the process exception if any.
    */
   final String message;
 
   /**
    * Contains the OS error code for the process exception if any.
    */
   final int errorCode;
 }