Clear |event_handler_| in UnprivilegedProcessDelegate::KillProcess() …

…so that the object could be reused to launch another process.

BUG=238821

Review URL: https://chromiumcodereview.appspot.com/15747007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201801 0039d316-1c4b-4281-b951-d872f2087c98

remoting/host/win/unprivileged_process_delegate.cc

@@ -349,6 +349,7 @@ void UnprivilegedProcessDelegate::KillProcess() {
   DCHECK(CalledOnValidThread());
 
   channel_.reset();
+  event_handler_ = NULL;
 
   if (worker_process_.IsValid()) {
     TerminateProcess(worker_process_, CONTROL_C_EXIT);