Shutdown the sandbox MessageServer before deleting it.

sandbox/mac/xpc_message_server.cc

 // Copyright 2014 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 "sandbox/mac/xpc_message_server.h"
 
 #include <bsm/libbsm.h>
 
 #include <string>
 
@@ skipping 30 matching lines @@
 
   std::string label = base::StringPrintf(
       "org.chromium.sandbox.XPCMessageServer.%p", demuxer_);
   dispatch_source_.reset(new base::DispatchSourceMach(
       label.c_str(), server_port_.get(), ^{ ReceiveMessage(); }));
   dispatch_source_->Resume();
 
   return true;
 }
 
+void XPCMessageServer::Shutdown() {
+  dispatch_source_.reset();
+}
+
 pid_t XPCMessageServer::GetMessageSenderPID(IPCMessage request) {
   audit_token_t token;
   xpc_dictionary_get_audit_token(request.xpc, &token);
   // TODO(rsesek): In the 10.7 SDK, there's audit_token_to_pid().
   pid_t sender_pid;
   audit_token_to_au32(token,
       NULL, NULL, NULL, NULL, NULL, &sender_pid, NULL, NULL);
   return sender_pid;
 }
 
@@ skipping 52 matching lines @@
   demuxer_->DemuxMessage(request);
 
   xpc_release(request.xpc);
   if (reply_message_) {
     xpc_release(reply_message_);
     reply_message_ = NULL;
   }
 }
 
 }  // namespace sandbox