Fix assertion failure in Process object, where non-integer pid could be passed to kill.

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 133 matching lines @@
   }
 
   OutputStream get stdin() {
     if (_closed) {
       throw new ProcessException("Process closed");
     }
     return _out.outputStream;
   }
 
   void kill() {
-    if (_closed && _pid === null && _errorHandler !== null) {
-      _errorHandler(new ProcessException("Process closed"));
+    if (_closed && _pid === null) {

[Søren Gjesse, 2012/01/06 13:43:20]

So we cannot ever have !_closed and _pid == null?

+      if (_errorHandler !== null) {
+        _errorHandler(new ProcessException("Process closed"));
+      }
       return;
     }
     if (_killed) {
       return;
     }
     // TODO(ager): Make the actual kill operation asynchronous.
     if (_kill(_pid)) {
       _killed = true;
       return;
     }
@@ skipping 42 matching lines @@
   Socket _err;
   Socket _exitHandler;
   int _pid;
   bool _closed;
   bool _killed;
   bool _started;
   Function _exitHandlerCallback;
   Function _errorHandler;
   Function _startHandler;
 }