Remove DestructionObserver for NetworkConfigWatcherMac.

net/base/network_config_watcher_mac.h

 // Copyright (c) 2010 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_CONFIG_WATCHER_MAC_H_
 #define NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_
 
 #include <SystemConfiguration/SCDynamicStore.h>
 
 #include "base/basictypes.h"
 #include "base/message_loop.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/scoped_ptr.h"
 
 namespace base {
 class Thread;
 }
 
 namespace net {
 
 // Base class for watching the Mac OS system network settings.
-class NetworkConfigWatcherMac : public MessageLoop::DestructionObserver {
+class NetworkConfigWatcherMac {
  public:
   // NOTE: The lifetime of Delegate is expected to exceed the lifetime of
   // NetworkConfigWatcherMac.
   class Delegate {
    public:
     virtual ~Delegate() {}
 
     // Called to register the notification keys on |store|.
     // Implementors are expected to call SCDynamicStoreSetNotificationKeys().
     // Will be called on the notifier thread.
     virtual void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store) = 0;
 
     // Called when one of the notification keys has changed.
     // Will be called on the notifier thread.
     virtual void OnNetworkConfigChange(CFArrayRef changed_keys) = 0;
   };
 
   explicit NetworkConfigWatcherMac(Delegate* delegate);
   virtual ~NetworkConfigWatcherMac();
 
  private:
-  // MessageLoop::DestructionObserver:
-  virtual void WillDestroyCurrentMessageLoop();
-
-  // Called on the notifier thread to initialize the notification
-  // implementation.  The SystemConfiguration calls in this function can lead to
-  // contention early on, so we invoke this function later on in startup to keep
-  // it fast.
-  void Init();
-
   // The thread used to listen for notifications.  This relays the notification
   // to the registered observers without posting back to the thread the object
   // was created on.
   scoped_ptr<base::Thread> notifier_thread_;
 
-  base::mac::ScopedCFTypeRef<CFRunLoopSourceRef> run_loop_source_;
-
-  Delegate* const delegate_;
-
   DISALLOW_COPY_AND_ASSIGN(NetworkConfigWatcherMac);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_