Corrects cleanup on an error during Process startup

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 170 matching lines @@
   // Use default Map so we keep order.
   static Map<int, _ProcessImpl> _processes = new Map<int, _ProcessImpl>();
 
   _ProcessImpl(String path,
                List<String> arguments,
                String this._workingDirectory,
                Map<String, String> environment,
                bool includeParentEnvironment,
                bool runInShell,
                ProcessStartMode mode) : super() {
-    _processes[_serviceId] = this;
     if (runInShell) {
       arguments = _getShellArguments(path, arguments);
       path = _getShellCommand();
     }
 
     if (path is !String) {
       throw new ArgumentError("Path is not a String: $path");
     }
     _path = path;
 
@@ skipping 230 matching lines @@
             var negative = _intFromBytes(ints, 4);
             assert(negative == 0 || negative == 1);
             return (negative == 0) ? code : -code;
           }
 
           void handleExit() {
             _ended = true;
             _exitCode.complete(exitCode(exitDataBuffer));
             // Kill stdin, helping hand if the user forgot to do it.
             _stdin._sink.destroy();
-            _processes.remove(_serviceId);
           }
 
           exitDataBuffer.setRange(
               exitDataRead, exitDataRead + data.length, data);
           exitDataRead += data.length;
           if (exitDataRead == EXIT_DATA_SIZE) {
             handleExit();
           }
         });
       }
@@ skipping 28 matching lines @@
         _stdin._sink._nativeSocket,
         _stdout._stream._nativeSocket,
         _stderr._stream._nativeSocket,
         _exitHandler._nativeSocket);
 
     getOutput(output, encoding) {
       if (encoding == null) return output;
       return encoding.decode(output);
     }
 
-    _processes.remove(_serviceId);
-
     return new ProcessResult(
         result[0],
         result[1],
         getOutput(result[2], stdoutEncoding),
         getOutput(result[3], stderrEncoding));
   }
 
   bool _startNative(String path,
                     List<String> arguments,
                     String workingDirectory,
@@ skipping 115 matching lines @@
       Encoding stderrEncoding) {
   var process = new _ProcessImpl(executable,
                                  arguments,
                                  workingDirectory,
                                  environment,
                                  includeParentEnvironment,
                                  runInShell,
                                  ProcessStartMode.NORMAL);
   return process._runAndWait(stdoutEncoding, stderrEncoding);
 }