Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/audio_low_latency_input_output_unittest.cc

Index: media/audio/audio_low_latency_input_output_unittest.cc
diff --git a/media/audio/audio_low_latency_input_output_unittest.cc b/media/audio/audio_low_latency_input_output_unittest.cc
index 36e3640dc9532563842a575b16196cdcf8f4c72e..3d33b0a0c52c27c90ffa94b2e6a4bb7f7823fdf1 100644
--- a/media/audio/audio_low_latency_input_output_unittest.cc
+++ b/media/audio/audio_low_latency_input_output_unittest.cc
@@ -24,6 +24,7 @@
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_unittest_util.h"
 #include "media/audio/fake_audio_log_factory.h"
+#include "media/audio/test_audio_thread.h"
 #include "media/base/seekable_buffer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -105,8 +106,7 @@ void OnLogMessage(const std::string& message) {}
 class MockAudioManager : public AudioManagerAnyPlatform {
  public:
   MockAudioManager()
-      : AudioManagerAnyPlatform(base::ThreadTaskRunnerHandle::Get(),
-                                base::ThreadTaskRunnerHandle::Get(),
+      : AudioManagerAnyPlatform(base::MakeUnique<TestAudioThread>(),
                                 &fake_audio_log_factory_) {}
   ~MockAudioManager() override {}