IO: Fix error in Process exit handling.

runtime/bin/process_win.cc

 // 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.
 
 #include <process.h>
 
 #include "bin/builtin.h"
 #include "bin/process.h"
 #include "bin/eventhandler.h"
 #include "bin/thread.h"
@@ skipping 373 matching lines @@
     return error_code;
   }
 
   // Setup info structures.
   STARTUPINFO startup_info;
   ZeroMemory(&startup_info, sizeof(startup_info));
   startup_info.cb = sizeof(startup_info);
   startup_info.hStdInput = stdin_handles[kReadHandle];
   startup_info.hStdOutput = stdout_handles[kWriteHandle];
   startup_info.hStdError = stderr_handles[kWriteHandle];
-  startup_info.dwFlags |= STARTF_USESTDHANDLES;
+  startup_info.dwFlags = STARTF_USESTDHANDLES;
 
   PROCESS_INFORMATION process_info;
   ZeroMemory(&process_info, sizeof(process_info));
 
   // Compute command-line length.
   int command_line_length = strlen(path);
   for (int i = 0; i < arguments_length; i++) {
     command_line_length += strlen(arguments[i]);
   }
   // Account for null termination and one space per argument.
@@ skipping 109 matching lines @@
   if (!result) {
     return false;
   }
   return true;
 }
 
 
 void Process::TerminateExitCodeHandler() {
   // Nothing needs to be done on Windows.
 }
-