WeakPtr destruction order cleanup: media edition.

content/renderer/media/crypto/ppapi_decryptor.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 CONTENT_RENDERER_MEDIA_CRYPTO_PPAPI_DECRYPTOR_H_
 #define CONTENT_RENDERER_MEDIA_CRYPTO_PPAPI_DECRYPTOR_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 106 matching lines @@
   media::SessionClosedCB session_closed_cb_;
   media::SessionErrorCB session_error_cb_;
 
   scoped_refptr<base::MessageLoopProxy> render_loop_proxy_;
 
   DecoderInitCB audio_decoder_init_cb_;
   DecoderInitCB video_decoder_init_cb_;
   NewKeyCB new_audio_key_cb_;
   NewKeyCB new_video_key_cb_;
 
+  // NOTE: This must always be last so it's invalidated before other member
+  // variables might be accessed.
   base::WeakPtrFactory<PpapiDecryptor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiDecryptor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CRYPTO_PPAPI_DECRYPTOR_H_