+++ This bug was initially created as a clone of Bug #1362108 +++ Changes since last update: #8377 Replace unnecessary `bind(this)` statements with arrow functions in `web/` files #8378 Convert the files in the `/src/shared` folder to ES6 modules #8340 Fix char spacing bug in SVG mode #8368 Enables source maps for webpack generated files. #8385 Fix typo in LoopbackPort export #8381 Re-factor `PDFDocumentProperties` such that it's properly reset when a new PDF file is opened (issue 8371) #8387 amends Babel cache (#8364) implementation to also work on Safari #8390 Upstream changes from: Bug 1319111 - Expose result principal URL ("final channel URL") on LoadInfo, convert current consumers of LOAD_REPLACE

Pushed by ryanvm@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/93bc09fa99ee Update pdf.js to version 1.8.331. r=bdahl