Always leak the Mojo parent pipe handle on child process shutdown.

mojo/edk/system/node_channel.cc

 // Copyright 2016 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 "mojo/edk/system/node_channel.h"
 
 #include <cstring>
 #include <limits>
 #include <sstream>
 
@@ skipping 190 matching lines @@
     relay->RemoveObserver(this);
 #endif
 
   base::AutoLock lock(channel_lock_);
   if (channel_) {
     channel_->ShutDown();
     channel_ = nullptr;
   }
 }
 
+void NodeChannel::LeakHandleOnShutdown() {
+  base::AutoLock lock(channel_lock_);
+  if (channel_) {
+    channel_->LeakHandle();
+  }
+}
+
 void NodeChannel::NotifyBadMessage(const std::string& error) {
   if (!process_error_callback_.is_null())
     process_error_callback_.Run("Received bad user message: " + error);
 }
 
 void NodeChannel::SetRemoteProcessHandle(base::ProcessHandle process_handle) {
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
   base::AutoLock lock(remote_process_handle_lock_);
   CHECK_NE(remote_process_handle_, base::GetCurrentProcessHandle());
   remote_process_handle_ = process_handle;
@@ skipping 616 matching lines @@
 
   base::AutoLock lock(channel_lock_);
   if (!channel_)
     DLOG(ERROR) << "Dropping message on closed channel.";
   else
     channel_->Write(std::move(message));
 }
 
 }  // namespace edk
 }  // namespace mojo