update_engine: Run clang-format on payload_generator/

BUG=none
TEST=unittest

Change-Id: I00cafb1fc709d8f02119cb0058cfcb0b573ef25d
Reviewed-on: https://chromium-review.googlesource.com/1409927
Commit-Ready: Amin Hassani <[email protected]>
Tested-by: Amin Hassani <[email protected]>
Reviewed-by: Sen Jiang <[email protected]>
diff --git a/payload_generator/tarjan.h b/payload_generator/tarjan.h
index 50cf563..39ac4e4 100644
--- a/payload_generator/tarjan.h
+++ b/payload_generator/tarjan.h
@@ -38,6 +38,7 @@
   void Execute(Vertex::Index vertex,
                Graph* graph,
                std::vector<Vertex::Index>* out);
+
  private:
   void Tarjan(Vertex::Index vertex, Graph* graph);