DCHECK that audio devices are stopped prior to destruction.

media/audio/audio_input_device_unittest.cc

Index: media/audio/audio_input_device_unittest.cc
diff --git a/media/audio/audio_input_device_unittest.cc b/media/audio/audio_input_device_unittest.cc
index eb144c6a4bf4346ef16e1e48b968bb127f56a5b1..28e9efce6c491e3821b5e87e372e2eaccbae1796 100644
--- a/media/audio/audio_input_device_unittest.cc
+++ b/media/audio/audio_input_device_unittest.cc
@@ -93,6 +93,8 @@ TEST(AudioInputDeviceTest, FailToCreateStream) {
   EXPECT_CALL(callback, OnCaptureError(_))
       .WillOnce(QuitLoop(io_loop.task_runner()));
   base::RunLoop().Run();
+  device->Stop();
+  base::RunLoop().RunUntilIdle();
 }
 
 ACTION_P5(ReportOnStreamCreated, device, handle, socket, length, segments) {
@@ -139,5 +141,8 @@ TEST(AudioInputDeviceTest, CreateStream) {
   EXPECT_CALL(callback, OnCaptureStarted())
       .WillOnce(QuitLoop(io_loop.task_runner()));
   base::RunLoop().Run();
+  device->Stop();
+  base::RunLoop().RunUntilIdle();
 }
+
 }  // namespace media.