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

mojo/edk/system/node_channel.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_NODE_CHANNEL_H_
 #define MOJO_EDK_SYSTEM_NODE_CHANNEL_H_
 
 #include <queue>
 #include <unordered_map>
 #include <utility>
@@ skipping 83 matching lines @@
 
   static void GetPortsMessageData(Channel::Message* message, void** data,
                                   size_t* num_data_bytes);
 
   // Start receiving messages.
   void Start();
 
   // Permanently stop the channel from sending or receiving messages.
   void ShutDown();
 
+  // Leaks the pipe handle instead of closing it on shutdown.
+  void LeakHandleOnShutdown();
+
   // Invokes the bad message callback for this channel, if any.
   void NotifyBadMessage(const std::string& error);
 
   void SetRemoteProcessHandle(base::ProcessHandle process_handle);
   bool HasRemoteProcessHandle();
   // Note: The returned |ProcessHandle| is owned by the caller and should be
   // freed if necessary.
   base::ProcessHandle CopyRemoteProcessHandle();
 
   // Used for context in Delegate calls (via |from_node| arguments.)
@@ skipping 78 matching lines @@
   PendingRelayMessageQueue pending_relay_messages_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(NodeChannel);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_NODE_CHANNEL_H_