void RenderFrameImpl::didMatchCSS(
    blink::WebLocalFrame* frame,
    const blink::WebVector<blink::WebString>& newly_matching_selectors,
    const blink::WebVector<blink::WebString>& stopped_matching_selectors) {
  DCHECK(!frame_ || frame_ == frame);

  FOR_EACH_OBSERVER(RenderViewObserver, render_view_->observers(),
                    DidMatchCSS(frame,
                                newly_matching_selectors,
                                stopped_matching_selectors));
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.