Both of the removed methods were added in PR 2719, however they are no longer used:
- It appears that `hasPendingRequests` was never used at all, even from the beginning.
- The only general PDF.js library usage of `abortAllRequests` was removed in PR 6879, which is now four years ago. (Originally the Firefox-specific network implementation, see https://searchfox.org/mozilla-central/source/browser/extensions/pdfjs/content/PdfJsNetwork.jsm, was shared with the `src/display/network.js` file and *there* this method is used. However, since all of the Firefox-specific code now lives directly in mozilla-central, that's not relevant for the removal in this patch.)