Possible security issue when deleting databases for IndexedDB

[rasviitanen]

When handeling the SyncOperation::DeleteDatabase case in handle_sync_operation we sanitize the name through an IndexedDBDescription and run std::fs::remove_dir_all(...) with this name.
If std::fs::remove_dir_all gets the wrong input, things can go very badly and start to delete the wrong files instead of the database files.

We should evaluate if this is a true security issue, or if the string sanitation covers all malicious input.

function:
handle_sync_operation
files:
components\net\indexeddb\idb_thread.rs