Fix double close in MojoAudioOutputStream.

content/browser/renderer_host/media/audio_sync_reader.cc

Index: content/browser/renderer_host/media/audio_sync_reader.cc
diff --git a/content/browser/renderer_host/media/audio_sync_reader.cc b/content/browser/renderer_host/media/audio_sync_reader.cc
index bbefb4bfd6d0efabb2f1fd89be14b239c3071427..be6afd9c52278e59d6977244823a22764c9ac066 100644
--- a/content/browser/renderer_host/media/audio_sync_reader.cc
+++ b/content/browser/renderer_host/media/audio_sync_reader.cc
@@ -5,6 +5,7 @@
 #include "content/browser/renderer_host/media/audio_sync_reader.h"
 
 #include <algorithm>
+#include <limits>
 #include <string>
 #include <utility>
 
@@ -140,6 +141,12 @@ std::unique_ptr<AudioSyncReader> AudioSyncReader::Create(
                                               std::move(foreign_socket)));
 }
 
+std::unique_ptr<base::CancelableSyncSocket>
+AudioSyncReader::TakeForeignSocket() {
+  DCHECK(foreign_socket_);
+  return std::move(foreign_socket_);
+}
+
 // media::AudioOutputController::SyncReader implementations.
 void AudioSyncReader::RequestMoreData(base::TimeDelta delay,
                                       base::TimeTicks delay_timestamp,