namespace changes

windows/flutter_filament_plugin.cpp

@@ -44,10 +44,11 @@
 #include "wgl_context.h"
 #endif
 
-using namespace std::chrono_literals;
-
 namespace flutter_filament {
 
+  using namespace std::chrono_literals;
+
+
 void FlutterFilamentPlugin::RegisterWithRegistrar(
     flutter::PluginRegistrarWindows *registrar) {
   auto channel =