WeakPtr destruction order cleanup: media edition.

media/filters/gpu_video_decoder.h

 // Copyright (c) 2012 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_FILTERS_GPU_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_GPU_VIDEO_DECODER_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 112 matching lines @@
   void PutSHM(SHMBuffer* shm_buffer);
 
   // Destroy all PictureBuffers in |buffers|, and delete their textures.
   void DestroyPictureBuffers(PictureBufferMap* buffers);
 
   // Assert the contract that this class is operated on the right thread.
   void DCheckGpuVideoAcceleratorFactoriesTaskRunnerIsCurrent() const;
 
   bool needs_bitstream_conversion_;
 
-  // Bound to factories_->GetMessageLoop().
-  base::WeakPtrFactory<GpuVideoDecoder> weak_factory_;
-  base::WeakPtr<GpuVideoDecoder> weak_this_;
-
   scoped_refptr<GpuVideoAcceleratorFactories> factories_;
 
   // Populated during Initialize() (on success) and unchanged until an error
   // occurs.
   scoped_ptr<VideoDecodeAccelerator> vda_;
 
   // Callbacks that are !is_null() only during their respective operation being
   // asynchronously executed.
   DecodeCB pending_decode_cb_;
   base::Closure pending_reset_cb_;
@@ skipping 34 matching lines @@
   // picture_buffer_id and the frame wrapping the corresponding Picture, for
   // frames that have been decoded but haven't been requested by a Decode() yet.
   std::list<scoped_refptr<VideoFrame> > ready_video_frames_;
   int32 next_picture_buffer_id_;
   int32 next_bitstream_buffer_id_;
 
   // Set during ProvidePictureBuffers(), used for checking and implementing
   // HasAvailableOutputFrames().
   int available_pictures_;
 
+  // Bound to factories_->GetMessageLoop().
+  // NOTE: Weak pointers must be invalidated before all other member variables.
+  base::WeakPtrFactory<GpuVideoDecoder> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_GPU_VIDEO_DECODER_H_