WeakPtr destruction order cleanup: media edition.

media/cast/cast_sender_impl.h

 // 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.
 #ifndef MEDIA_CAST_CAST_SENDER_IMPL_H_
 #define MEDIA_CAST_CAST_SENDER_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/cast/audio_sender/audio_sender.h"
 #include "media/cast/cast_config.h"
@@ skipping 39 matching lines @@
   scoped_ptr<AudioSender> audio_sender_;
   scoped_ptr<VideoSender> video_sender_;
   scoped_refptr<AudioFrameInput> audio_frame_input_;
   scoped_refptr<VideoFrameInput> video_frame_input_;
   scoped_refptr<CastEnvironment> cast_environment_;
   // The transport sender is owned by the owner of the CastSender, and should be
   // valid throughout the lifetime of the CastSender.
   transport::CastTransportSender* const transport_sender_;
   uint32 ssrc_of_audio_sender_;
   uint32 ssrc_of_video_sender_;
+
+  // NOTE: This must always be last so it's invalidated before other member
+  // variables might be accessed.
   base::WeakPtrFactory<CastSenderImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CastSenderImpl);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_CAST_SENDER_IMPL_H_