Convert //media/audio from scoped_ptr to std::unique_ptr

media/audio/fake_audio_log_factory.h

Index: media/audio/fake_audio_log_factory.h
diff --git a/media/audio/fake_audio_log_factory.h b/media/audio/fake_audio_log_factory.h
index bbd31e985912408a318b78c9d085365ad89f2988..d78d533361eb8d1a0b8e3f65099f796bd9238a0a 100644
--- a/media/audio/fake_audio_log_factory.h
+++ b/media/audio/fake_audio_log_factory.h
@@ -18,7 +18,7 @@ class MEDIA_EXPORT FakeAudioLogFactory
  public:
   FakeAudioLogFactory();
   ~FakeAudioLogFactory() override;
-  scoped_ptr<AudioLog> CreateAudioLog(AudioComponent component) override;
+  std::unique_ptr<AudioLog> CreateAudioLog(AudioComponent component) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FakeAudioLogFactory);