Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/win/audio_low_latency_output_win_unittest.cc

Index: media/audio/win/audio_low_latency_output_win_unittest.cc
diff --git a/media/audio/win/audio_low_latency_output_win_unittest.cc b/media/audio/win/audio_low_latency_output_win_unittest.cc
index 024580c2884adf089b8e65e0439967e3d5472ca3..2de9110482e1baa4a2583606feeb6e4127f9d2de 100644
--- a/media/audio/win/audio_low_latency_output_win_unittest.cc
+++ b/media/audio/win/audio_low_latency_output_win_unittest.cc
@@ -13,6 +13,7 @@
 
 #include "base/environment.h"
 #include "base/files/file_util.h"
+#include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
@@ -25,6 +26,7 @@
 #include "media/audio/audio_manager.h"
 #include "media/audio/audio_unittest_util.h"
 #include "media/audio/mock_audio_source_callback.h"
+#include "media/audio/test_audio_thread.h"
 #include "media/audio/win/core_audio_util_win.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/seekable_buffer.h"
@@ -235,17 +237,14 @@ class WASAPIAudioOutputStreamTest : public ::testing::Test {
  public:
   WASAPIAudioOutputStreamTest() {
     audio_manager_ =
-        AudioManager::CreateForTesting(message_loop_.task_runner());
-    base::RunLoop().RunUntilIdle();
-  }
-  ~WASAPIAudioOutputStreamTest() override {
-    audio_manager_.reset();
+        AudioManager::CreateForTesting(base::MakeUnique<TestAudioThread>());
     base::RunLoop().RunUntilIdle();
   }
+  ~WASAPIAudioOutputStreamTest() override { audio_manager_->Shutdown(); }
 
  protected:
   base::MessageLoopForUI message_loop_;
-  ScopedAudioManagerPtr audio_manager_;
+  std::unique_ptr<AudioManager> audio_manager_;
 };
 
 // Test Create(), Close() calling sequence.