Fix double close in MojoAudioOutputStream.

base/sync_socket.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 BASE_SYNC_SOCKET_H_
 #define BASE_SYNC_SOCKET_H_
 
 // A socket abstraction used for sending and receiving plain
 // data.  Because the receiving is blocking, they can be used to perform
 // rudimentary cross-process synchronization with low latency.
@@ skipping 75 matching lines @@
                                     TimeDelta timeout);
 
   // Returns the number of bytes available. If non-zero, Receive() will not
   // not block when called.
   virtual size_t Peek();
 
   // Extracts the contained handle.  Used for transferring between
   // processes.
   Handle handle() const { return handle_; }
 
+  // Extracts and takes ownership of the contained handle.
+  Handle Release();
+
  protected:
   Handle handle_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncSocket);
 };
 
 // Derives from SyncSocket and adds support for shutting down the socket from
 // another thread while a blocking Receive or Send is being done from the
 // thread that owns the socket.
@@ skipping 43 matching lines @@
 
 #if defined(OS_WIN) && !defined(COMPONENT_BUILD)
 // TODO(cpu): remove this once chrome is split in two dlls.
 __declspec(selectany)
     const SyncSocket::Handle SyncSocket::kInvalidHandle = INVALID_HANDLE_VALUE;
 #endif
 
 }  // namespace base
 
 #endif  // BASE_SYNC_SOCKET_H_