Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/audio_input_controller_unittest.cc

Index: media/audio/audio_input_controller_unittest.cc
diff --git a/media/audio/audio_input_controller_unittest.cc b/media/audio/audio_input_controller_unittest.cc
index 545cd1d615fcb5304122beefdfd5308a427f0f9e..b3168fee829f04cb652ba2c0fd4dd55feb81fe78 100644
--- a/media/audio/audio_input_controller_unittest.cc
+++ b/media/audio/audio_input_controller_unittest.cc
@@ -89,8 +89,8 @@ class AudioInputControllerTest : public testing::Test {
   }
   ~AudioInputControllerTest() override {
     audio_task_runner()->PostTask(
-        FROM_HERE, base::Bind(&AudioInputControllerTest::DeleteAudioManager,
-                              base::Unretained(this)));
+        FROM_HERE, base::Bind(&AudioManager::Shutdown,
+                              base::Unretained(audio_manager_.get())));
     audio_thread_.Stop();
   }
 
@@ -107,13 +107,12 @@ class AudioInputControllerTest : public testing::Test {
   void ResumeAudioThread() { suspend_event_.Signal(); }
 
  private:
-  void DeleteAudioManager() { audio_manager_.reset(); }
   void WaitForResume() { suspend_event_.Wait(); }
 
  protected:
   base::Thread audio_thread_;
   base::MessageLoop message_loop_;
-  ScopedAudioManagerPtr audio_manager_;
+  std::unique_ptr<AudioManager> audio_manager_;
   WaitableEvent suspend_event_;
 
  private: