StructTraits to map mus::mojom::Event to unique_ptr<ui::Event>

ash/mus/accelerator_registrar_unittest.cc

Index: ash/mus/accelerator_registrar_unittest.cc
diff --git a/ash/mus/accelerator_registrar_unittest.cc b/ash/mus/accelerator_registrar_unittest.cc
index f9336fbbefc81ed2562e3f2949e9c30d1e3a8a83..e24e233ceabe7240fbdc87a5eaf312cc375774ba 100644
--- a/ash/mus/accelerator_registrar_unittest.cc
+++ b/ash/mus/accelerator_registrar_unittest.cc
@@ -56,7 +56,8 @@ class TestAcceleratorHandler : public AcceleratorHandler {
   }
 
   // AcceleratorHandler:
-  void OnAccelerator(uint32_t id, ::mus::mojom::EventPtr event) override {}
+  void OnAccelerator(uint32_t id,
+                     const std::unique_ptr<ui::Event>& event) override {}
 
   std::set<uint32_t> installed_accelerators_;
   std::unique_ptr<base::RunLoop> run_loop_;