[dart:io][windows] Use WriteFile instead of _write

runtime/bin/process_patch.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.
 
 @patch class _WindowsCodePageDecoder {
   @patch static String _decodeBytes(List<int> bytes)
       native "SystemEncodingToString";
 }
 
 
@@ skipping 239 matching lines @@
       });
     }
 
     if (mode is !ProcessStartMode) {
       throw new ArgumentError("Mode is not a ProcessStartMode: $mode");
     }
     _mode = mode;
 
     if (mode != ProcessStartMode.DETACHED) {
       // stdin going to process.
-      _stdin = new _StdSocketSink(new _Socket._writePipe());
+      _stdin = new _StdSink(new _Socket._writePipe());
       _stdin._sink._owner = this;
       // stdout coming from process.
       _stdout = new _StdStream(new _Socket._readPipe());
       _stdout._stream._owner = this;
       // stderr coming from process.
       _stderr = new _StdStream(new _Socket._readPipe());
       _stderr._stream._owner = this;
     }
     if (mode == ProcessStartMode.NORMAL) {
       _exitHandler = new _Socket._readPipe();
@@ skipping 244 matching lines @@
   }
 
   int get pid => _ProcessUtils._pid(this);
 
   String _path;
   List<String> _arguments;
   String _workingDirectory;
   List<String> _environment;
   ProcessStartMode _mode;
   // Private methods of Socket are used by _in, _out, and _err.
-  _StdSocketSink _stdin;
+  _StdSink _stdin;
   _StdStream _stdout;
   _StdStream _stderr;
   Socket _exitHandler;
   bool _ended;
   bool _started;
   Completer<int> _exitCode;
 }
 
 
 // _NonInteractiveProcess is a wrapper around an interactive process
@@ skipping 59 matching lines @@
       Encoding stderrEncoding) {
   var process = new _ProcessImpl(executable,
                                  arguments,
                                  workingDirectory,
                                  environment,
                                  includeParentEnvironment,
                                  runInShell,
                                  ProcessStartMode.NORMAL);
   return process._runAndWait(stdoutEncoding, stderrEncoding);
 }