LibWeb: Start tracking elapsed time when a resource is loaded

Author: https://github.com/bgianfo
Commit: bca8707e15
Pull-request: https://github.com/SerenityOS/serenity/pull/9991
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/Loader/FrameLoader.cpp

@@ -137,7 +137,7 @@ bool FrameLoader::parse_document(DOM::Document& document, const ByteBuffer& data
     return false;
 }
 
-bool FrameLoader::load(const LoadRequest& request, Type type)
+bool FrameLoader::load(LoadRequest& request, Type type)
 {
     if (!request.is_valid()) {
         load_error_page(request.url(), "Invalid request");