Declaring the weak_ptr_factory in proper order.

chrome/browser/chromeos/camera_presence_notifier.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CAMERA_PRESENCE_NOTIFIER_H_
 #define CHROME_BROWSER_CHROMEOS_CAMERA_PRESENCE_NOTIFIER_H_
 
 #include "base/memory/singleton.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
@@ skipping 19 matching lines @@
  private:
   friend struct DefaultSingletonTraits<CameraPresenceNotifier>;
   CameraPresenceNotifier();
   ~CameraPresenceNotifier();
 
   void CheckCameraPresence();
 
   // Sends out a camera presence status notification.
   void OnCameraPresenceCheckDone();
 
-  base::WeakPtrFactory<CameraPresenceNotifier> weak_factory_;
-
   bool camera_present_on_last_check_;
 
   // Timer for camera check cycle.
   base::RepeatingTimer<CameraPresenceNotifier> camera_check_timer_;
 
   ObserverList<Observer> observers_;
 
+  base::WeakPtrFactory<CameraPresenceNotifier> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(CameraPresenceNotifier);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CAMERA_PRESENCE_NOTIFIER_H_