Mojo C++ bindings: switch services/ui/public/interfaces mojom target to use STL types.

ui/aura/mus/drag_drop_controller_mus.cc

Index: ui/aura/mus/drag_drop_controller_mus.cc
diff --git a/ui/aura/mus/drag_drop_controller_mus.cc b/ui/aura/mus/drag_drop_controller_mus.cc
index b59f17792c3270ad2c9f47189a1812172ddb574f..58cb4e5e0d1d4e4e3ecf2ce741b54063e6a20496 100644
--- a/ui/aura/mus/drag_drop_controller_mus.cc
+++ b/ui/aura/mus/drag_drop_controller_mus.cc
@@ -146,10 +146,9 @@ int DragDropControllerMus::StartDragAndDrop(
   std::map<std::string, std::vector<uint8_t>> drag_data =
       static_cast<const aura::OSExchangeDataProviderMus&>(data.provider())
           .GetData();
-  window_tree_->PerformDragDrop(
-      change_id, source_window_mus->server_id(),
-      mojo::Map<mojo::String, mojo::Array<uint8_t>>::From(drag_data),
-      drag_operations);
+  window_tree_->PerformDragDrop(change_id, source_window_mus->server_id(),
+                                mojo::MapToUnorderedMap(drag_data),
+                                drag_operations);
 
   base::MessageLoop* loop = base::MessageLoop::current();
   base::MessageLoop::ScopedNestableTaskAllower allow_nested(loop);