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

media/blink/video_frame_compositor.h

Index: media/blink/video_frame_compositor.h
diff --git a/media/blink/video_frame_compositor.h b/media/blink/video_frame_compositor.h
index 893fa7c43688f5a3218b9a88a2e402b061e498b7..1ae8db285584d857b631f5dd26a3f93eb4600f2a 100644
--- a/media/blink/video_frame_compositor.h
+++ b/media/blink/video_frame_compositor.h
@@ -111,7 +111,7 @@ class MEDIA_BLINK_EXPORT VideoFrameCompositor
   // PaintFrameUsingOldRenderingPath() is not also called while stopped.)
   base::TimeDelta GetCurrentFrameTimestamp() const;
 
-  void set_tick_clock_for_testing(scoped_ptr<base::TickClock> tick_clock) {
+  void set_tick_clock_for_testing(std::unique_ptr<base::TickClock> tick_clock) {
     tick_clock_ = std::move(tick_clock);
   }
 
@@ -148,7 +148,7 @@ class MEDIA_BLINK_EXPORT VideoFrameCompositor
                   bool background_rendering);
 
   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
-  scoped_ptr<base::TickClock> tick_clock_;
+  std::unique_ptr<base::TickClock> tick_clock_;
 
   // These callbacks are executed on the compositor thread.
   const base::Callback<void(gfx::Size)> natural_size_changed_cb_;