Made Destroy() followup more aggressive to test for races.

webkit/plugins/ppapi/ppb_video_decoder_impl.cc

 // Copyright (c) 2011 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 "webkit/plugins/ppapi/ppb_video_decoder_impl.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 158 matching lines @@
   reset_callback_ = callback;
 
   platform_video_decoder_->Reset();
   return PP_OK_COMPLETIONPENDING;
 }
 
 void PPB_VideoDecoder_Impl::Destroy() {
   if (!platform_video_decoder_)
     return;
   platform_video_decoder_->Destroy();
+  platform_video_decoder_ = NULL;
+  ppp_videodecoder_ = NULL;
 }
 
 void PPB_VideoDecoder_Impl::ProvidePictureBuffers(
     uint32 requested_num_of_buffers, const gfx::Size& dimensions) {
   if (!ppp_videodecoder_)
     return;
 
   PP_Size out_dim = PP_MakeSize(dimensions.width(), dimensions.height());
   ScopedResourceId resource(this);
   ppp_videodecoder_->ProvidePictureBuffers(
@@ skipping 72 matching lines @@
 
 void PPB_VideoDecoder_Impl::NotifyInitializeDone() {
   if (initialization_callback_.func == NULL)
     return;
 
   PP_RunAndClearCompletionCallback(&initialization_callback_, PP_OK);
 }
 
 }  // namespace ppapi
 }  // namespace webkit