Close @dialog. When handling a #WebKitScriptDialog asynchronously (webkit_script_dialog_ref()
was called in #WebKitWebView::script-dialog callback), this function needs to be called to notify
that we are done with the script dialog. The dialog will be closed on destruction if this function
hasn't been called before.
Close @dialog. When handling a #WebKitScriptDialog asynchronously (webkit_script_dialog_ref() was called in #WebKitWebView::script-dialog callback), this function needs to be called to notify that we are done with the script dialog. The dialog will be closed on destruction if this function hasn't been called before.