Use the location where FileDescriptorWatcher is created to track the libevent handlers

components/crash/content/browser/crash_handler_host_linux.cc

 // Copyright 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 "components/crash/content/browser/crash_handler_host_linux.h"
 
 #include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ skipping 81 matching lines @@
 // non-refcounted pointers.
 
 CrashHandlerHostLinux::CrashHandlerHostLinux(const std::string& process_type,
                                              const base::FilePath& dumps_path,
                                              bool upload)
     : process_type_(process_type),
       dumps_path_(dumps_path),
 #if !defined(OS_ANDROID)
       upload_(upload),
 #endif
+      file_descriptor_watcher_(FROM_HERE),
       shutting_down_(false),
       worker_pool_token_(base::SequencedWorkerPool::GetSequenceToken()) {
   write_dump_file_sequence_checker_.DetachFromSequence();
 
   int fds[2];
   // We use SOCK_SEQPACKET rather than SOCK_DGRAM to prevent the process from
   // sending datagrams to other sockets on the system. The sandbox may prevent
   // the process from calling socket() to create new sockets, but it'll still
   // inherit some sockets. With PF_UNIX+SOCK_DGRAM, it can call sendmsg to send
   // a datagram to any (abstract) socket on the same system. With
@@ skipping 380 matching lines @@
   // no-ops.
   shutting_down_ = true;
   uploader_thread_->Stop();
 }
 
 bool CrashHandlerHostLinux::IsShuttingDown() const {
   return shutting_down_;
 }
 
 }  // namespace breakpad