Log Message:
Update to 60.9.0

* Fix build with rust-1.39.0

Changelog:
#CVE-2019-11746: Use-after-free while manipulating video
#CVE-2019-11744: XSS by breaking out of title and textarea elements using innerHTML
#CVE-2019-11742: Same-origin policy violation with SVG filters and canvas to \ 
steal cross-origin images
#CVE-2019-11753: Privilege escalation with Mozilla Maintenance Service in custom \ 
Firefox installation location
#CVE-2019-11752: Use-after-free while extracting a key value in IndexedDB
#CVE-2019-9812: Sandbox escape through Firefox Sync
#CVE-2019-11743: Cross-origin access to unload event attributes
#CVE-2019-11740: Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and \ 
Firefox ESR 60.9