Stop watching the netlink file descriptor before the message pump is destroye...

net/base/network_change_notifier_linux.h

 // Copyright (c) 2009 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 NET_BASE_NETWORK_CHANGE_NOTIFIER_LINUX_H_
 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_LINUX_H_
 
 #include "base/basictypes.h"
 #include "base/message_loop.h"
 #include "base/observer_list.h"
 #include "net/base/network_change_notifier.h"
 
 namespace net {
 
 class NetworkChangeNotifierLinux
-    : public NetworkChangeNotifier, public MessageLoopForIO::Watcher {
+    : public NetworkChangeNotifier,
+      public MessageLoopForIO::Watcher,
+      public MessageLoop::DestructionObserver {
  public:
   NetworkChangeNotifierLinux();
 
   // NetworkChangeNotifier methods:
 
   virtual void AddObserver(Observer* observer) {
     observers_.AddObserver(observer);
   }
 
   virtual void RemoveObserver(Observer* observer) {
     observers_.RemoveObserver(observer);
   }
 
   // MessageLoopForIO::Watcher methods:
 
   virtual void OnFileCanReadWithoutBlocking(int fd);
   virtual void OnFileCanWriteWithoutBlocking(int /* fd */);
 
+  // MessageLoop::DestructionObserver methods:
+
+  virtual void WillDestroyCurrentMessageLoop();
+
  private:
   virtual ~NetworkChangeNotifierLinux();
 
   // Starts listening for netlink messages.  Also handles the messages if there
   // are any available on the netlink socket.
   void ListenForNotifications();
 
   // Attempts to read from the netlink socket into |buf| of length |len|.
   // Returns the bytes read on synchronous success and ERR_IO_PENDING if the
   // recv() would block.  Otherwise, it returns a net error code.
   int ReadNotificationMessage(char* buf, size_t len);
 
+  // Stops watching the netlink file descriptor.
+  void StopWatching();
+
   ObserverList<Observer, true> observers_;
 
   int netlink_fd_;  // This is the netlink socket descriptor.
-  MessageLoopForIO* const loop_;
+  MessageLoopForIO* loop_;
   MessageLoopForIO::FileDescriptorWatcher netlink_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierLinux);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_CHANGE_NOTIFIER_LINUX_H_