Convert //chromecast from scoped_ptr to std::unique_ptr

chromecast/browser/media/cast_renderer.h

Index: chromecast/browser/media/cast_renderer.h
diff --git a/chromecast/browser/media/cast_renderer.h b/chromecast/browser/media/cast_renderer.h
index ed89de5a382930b468a032fdee4ece4faddaa040..5866e94d4ee52641271370379c94ed22949c2e51 100644
--- a/chromecast/browser/media/cast_renderer.h
+++ b/chromecast/browser/media/cast_renderer.h
@@ -51,8 +51,8 @@ class CastRenderer : public ::media::Renderer {
   const CreateMediaPipelineBackendCB create_backend_cb_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_refptr<BalancedMediaTaskRunnerFactory> media_task_runner_factory_;
-  scoped_ptr<TaskRunnerImpl> backend_task_runner_;
-  scoped_ptr<MediaPipelineImpl> pipeline_;
+  std::unique_ptr<TaskRunnerImpl> backend_task_runner_;
+  std::unique_ptr<MediaPipelineImpl> pipeline_;
   bool eos_[2];
   base::Closure ended_cb_;
   DISALLOW_COPY_AND_ASSIGN(CastRenderer);