Fixed failing DCHECK in GpuVideoDecodeAccelerator destructor.

content/common/gpu/media/gpu_video_decode_accelerator.cc

 // 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.
 
 #include "content/common/gpu/media/gpu_video_decode_accelerator.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 441 matching lines @@
   // So we have to wait for the RemoveFilter callback here instead and remove
   // the VDA after it arrives and before returning.
   if (filter_.get()) {
     stub_->channel()->RemoveFilter(filter_.get());
     filter_removed_.Wait();
   }
 
   stub_->channel()->RemoveRoute(host_route_id_);
   stub_->RemoveDestructionObserver(this);
 
+  video_decode_accelerator_.reset();
   delete this;
 }
 
 void GpuVideoDecodeAccelerator::SetTextureCleared(
     const media::Picture& picture) {
   DCHECK(child_message_loop_->BelongsToCurrentThread());
   DebugAutoLock auto_lock(debug_uncleared_textures_lock_);
   std::map<int32, scoped_refptr<gpu::gles2::TextureRef> >::iterator it;
   it = uncleared_textures_.find(picture.picture_buffer_id());
   if (it == uncleared_textures_.end())
@@ skipping 15 matching lines @@
   return stub_->channel()->Send(message);
 }
 
 void GpuVideoDecodeAccelerator::SendCreateDecoderReply(IPC::Message* message,
                                                        bool succeeded) {
   GpuCommandBufferMsg_CreateVideoDecoder::WriteReplyParams(message, succeeded);
   Send(message);
 }
 
 }  // namespace content