Fix double close in MojoAudioOutputStream.

content/browser/renderer_host/media/audio_sync_reader.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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <memory>
@@ skipping 23 matching lines @@
 // process.
 class AudioSyncReader : public media::AudioOutputController::SyncReader {
  public:
   ~AudioSyncReader() override;
 
   // Returns null on failure.
   static std::unique_ptr<AudioSyncReader> Create(
       const media::AudioParameters& params);
 
   base::SharedMemory* shared_memory() const { return shared_memory_.get(); }
-  base::CancelableSyncSocket* foreign_socket() const {
-    return foreign_socket_.get();
-  }
+
+  std::unique_ptr<base::CancelableSyncSocket> TakeForeignSocket();
 
   // media::AudioOutputController::SyncReader implementations.
   void RequestMoreData(base::TimeDelta delay,
                        base::TimeTicks delay_timestamp,
                        int prior_frames_skipped) override;
   void Read(media::AudioBus* dest) override;
   void Close() override;
 
  private:
   AudioSyncReader(const media::AudioParameters& params,
@@ skipping 36 matching lines @@
   // The index of the audio buffer we're expecting to be sent from the renderer;
   // used to block with timeout for audio data.
   uint32_t buffer_index_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioSyncReader);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_