Chromecast: fixes crash in AvPipelineImpl teardown.

chromecast/media/cma/pipeline/av_pipeline_impl.h

 // Copyright 2014 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 CHROMECAST_MEDIA_CMA_BASE_AV_PIPELINE_IMPL_H_
 #define CHROMECAST_MEDIA_CMA_BASE_AV_PIPELINE_IMPL_H_
 
 #include <list>
 
 #include "base/callback.h"
@@ skipping 41 matching lines @@
   // Setting the frame provider or the client must be done in the
   // |kUninitialized| state.
   void SetCodedFrameProvider(scoped_ptr<CodedFrameProvider> frame_provider,
                              size_t max_buffer_size,
                              size_t max_frame_size);
   void SetClient(const AvPipelineClient& client);
 
   // Initialize the pipeline.
   bool Initialize();
 
+  // Destroy the pipeline. No other calls into AvPipelineImpl must be made
+  // after this.
+  void Finalize();
+
   // Setup the pipeline and ensure samples are available for the given media
   // time, then start rendering samples.
   bool StartPlayingFrom(base::TimeDelta time,
                         const scoped_refptr<BufferingState>& buffering_state);
 
   // Flush any remaining samples in the pipeline.
   // Invoke |done_cb| when flush is completed.
   void Flush(const base::Closure& done_cb);
 
   // Tear down the pipeline and release the hardware resources.
@@ skipping 91 matching lines @@
   BrowserCdmCast* media_keys_;
   int media_keys_callback_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AvPipelineImpl);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_BASE_AV_PIPELINE_IMPL_H_