Convert some audio code to OnceCallback.

media/audio/audio_output_controller_unittest.cc

Index: media/audio/audio_output_controller_unittest.cc
diff --git a/media/audio/audio_output_controller_unittest.cc b/media/audio/audio_output_controller_unittest.cc
index bb786e923bfe3d03344c9e7644aa0773d15ce9f1..674c49af60bcf2bf825d2e19a32a4d5a48c5dc6f 100644
--- a/media/audio/audio_output_controller_unittest.cc
+++ b/media/audio/audio_output_controller_unittest.cc
@@ -168,7 +168,7 @@ class AudioOutputControllerTest : public testing::Test {
     // AudioManager.
     audio_manager_->GetTaskRunner()->PostTask(
         FROM_HERE,
-        base::Bind(&AudioOutputController::OnDeviceChange, controller_));
+        base::BindOnce(&AudioOutputController::OnDeviceChange, controller_));
   }
 
   void Divert(bool was_playing, int num_times_to_be_started) {
@@ -249,8 +249,8 @@ class AudioOutputControllerTest : public testing::Test {
 
     base::RunLoop run_loop;
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(&AudioOutputController::Close, controller_,
-                              run_loop.QuitClosure()));
+        FROM_HERE, base::BindOnce(&AudioOutputController::Close, controller_,
+                                  run_loop.QuitClosure()));
     run_loop.Run();
   }