Change new List(n) to return fixed length list.

runtime/bin/process_patch.dart

 // Copyright (c) 2012, 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 35 matching lines @@
   _ProcessImpl(String path, List<String> arguments, ProcessOptions options) {
     if (path is !String) {
       throw new ArgumentError("Path is not a String: $path");
     }
     _path = path;
 
     if (arguments is !List) {
       throw new ArgumentError("Arguments is not a List: $arguments");
     }
     int len = arguments.length;
-    _arguments = new List<String>.fixedLength(len);
+    _arguments = new List<String>(len);
     for (int i = 0; i < len; i++) {
       var arg = arguments[i];
       if (arg is !String) {
         throw new ArgumentError("Non-string argument: $arg");
       }
       _arguments[i] = arguments[i];
       if (Platform.operatingSystem == 'windows') {
         _arguments[i] = _windowsArgumentEscape(_arguments[i]);
       }
     }
@@ skipping 107 matching lines @@
                                  status._errorMessage,
                                  status._errorCode));
         return;
       }
       _started = true;
 
       // Setup an exit handler to handle internal cleanup and possible
       // callback when a process terminates.
       int exitDataRead = 0;
       final int EXIT_DATA_SIZE = 8;
-      List<int> exitDataBuffer = new List<int>.fixedLength(EXIT_DATA_SIZE);
+      List<int> exitDataBuffer = new List<int>(EXIT_DATA_SIZE);
       _exitHandler.listen((data) {
 
         int exitCode(List<int> ints) {
           var code = _intFromBytes(ints, 0);
           var negative = _intFromBytes(ints, 4);
           assert(negative == 0 || negative == 1);
           return (negative == 0) ? code : -code;
         }
 
         void handleExit() {
@@ skipping 131 matching lines @@
 
 class _ProcessResult implements ProcessResult {
   const _ProcessResult(int this.exitCode,
                        String this.stdout,
                        String this.stderr);
 
   final int exitCode;
   final String stdout;
   final String stderr;
 }