Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/win/audio_output_win_unittest.cc

Index: media/audio/win/audio_output_win_unittest.cc
diff --git a/media/audio/win/audio_output_win_unittest.cc b/media/audio/win/audio_output_win_unittest.cc
index 23c85e5918c6ae5737de1738078d49d3cf63229a..a26162ac208b7f47695a895638f383b7749f2840 100644
--- a/media/audio/win/audio_output_win_unittest.cc
+++ b/media/audio/win/audio_output_win_unittest.cc
@@ -11,6 +11,7 @@
 
 #include "base/base_paths.h"
 #include "base/memory/aligned_memory.h"
+#include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/sync_socket.h"
@@ -22,6 +23,7 @@
 #include "media/audio/audio_unittest_util.h"
 #include "media/audio/mock_audio_source_callback.h"
 #include "media/audio/simple_sources.h"
+#include "media/audio/test_audio_thread.h"
 #include "media/base/limits.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -154,17 +156,14 @@ class WinAudioTest : public ::testing::Test {
  public:
   WinAudioTest() {
     audio_manager_ =
-        AudioManager::CreateForTesting(message_loop_.task_runner());
-    base::RunLoop().RunUntilIdle();
-  }
-  ~WinAudioTest() override {
-    audio_manager_.reset();
+        AudioManager::CreateForTesting(base::MakeUnique<TestAudioThread>());
     base::RunLoop().RunUntilIdle();
   }
+  ~WinAudioTest() override { audio_manager_->Shutdown(); }
 
  protected:
   base::MessageLoop message_loop_;
-  ScopedAudioManagerPtr audio_manager_;
+  std::unique_ptr<AudioManager> audio_manager_;
 };
 
 // ===========================================================================