Convert some audio code to OnceCallback.

media/base/bind_to_current_loop_unittest.cc

 // 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.
 
 #include "media/base/bind_to_current_loop.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/memory/free_deleter.h"
@@ skipping 204 matching lines @@
                  base::MakeUnique<ThreadRestrictionChecker>()));
   target_thread.task_runner()->PostTask(
       FROM_HERE, base::Bind(&ClearReference, base::Passed(&cb)));
   target_thread.FlushForTesting();
   ASSERT_FALSE(cb);
   base::RunLoop().RunUntilIdle();
 
   target_thread.Stop();
 }
 
+TEST_F(BindToCurrentLoopTest, SeveralCalls) {
+  base::Closure cl = base::Bind([]() {});
+  base::Closure bound_cl = BindToCurrentLoop(std::move(cl));
+  bound_cl.Run();
+  bound_cl.Run();
+  base::RunLoop().RunUntilIdle();
+}
+
 }  // namespace media