LibWeb: Stub XMLHttpRequest.abort

Author: https://github.com/Lubrsi
Commit: 6c21c72492
Pull-request: https://github.com/SerenityOS/serenity/pull/15964
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp

@@ -648,4 +648,9 @@ bool XMLHttpRequest::must_survive_garbage_collection() const
     return false;
 }
 
+void XMLHttpRequest::abort()
+{
+    dbgln("(STUBBED) XMLHttpRequest::abort()");
+}
+
 }