Upgrade the windows specific version of LaunchProcess to avoid raw handles.

base/process/kill_mac.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/process/kill.h"
 
 #include <signal.h>
 #include <sys/event.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ skipping 147 matching lines @@
     DPLOG(ERROR) << "kill(" << child << ", SIGKILL)";
   } else {
     // The child is definitely on the way out now. BlockingReap won't need to
     // wait for long, if at all.
     BlockingReap(child);
   }
 }
 
 }  // namespace
 
-void EnsureProcessTerminated(ProcessHandle process) {
-  WaitForChildToDie(process, kWaitBeforeKillSeconds);
+void EnsureProcessTerminated(Process process) {
+  WaitForChildToDie(process.pid(), kWaitBeforeKillSeconds);
 }
 
 }  // namespace base