Bug 967153: Update NSS to NSS 3.16 beta 1 (NSS_3_16_BETA1), r=me, a=sylvestre

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extra : amend_source : 52622ab6fc23f283d38508e2effcd6adf763fbb3
Bug 967153: Update configure.in to require NSS 3.16, r=me, a=sylvestre

--HG--
extra : source : 5b5e7559cda52d895d2d9034179ff1da087d5ddf
extra : amend_source : bb8aecd250a066dd742b5db5df39dc3a8b655efa
Bug 945912 - Fix palette length reporting bug. r=jmuizelaar, a=lsblakk
Bug 965137 - Make session saving more reliable. r=mfinkle, a=sledru
Bug 960046 - [OS.File] makeDir should not fail if the directory is a root. r=Yoric, a=sledru
Bug 970990 - Remove background-attachment fixed watermark from metrofx startui. r=mbrubeck, a=sledru
Bug 966348 - Rename Promise.cast to Promise.resolve. r=bz, a=sledru
Bug 967432 - labelElement should still be set even when an access key is not present. r=neil, a=sledru
Bug 970380 - Fix width and height of Australis SDK buttons in panel. r=jaws, a=sledru
Bug 964267 - Fix star button pressed state on Australis. r=mikedeboer, a=sledru
Bug 971257 - Fix 'more tools' to not show up after reset in Australis customization palette. r=jaws, a=sledru
bug 961528 - holepunch chart.apis.google.com from the HSTS preload list r=briansmith a=sylvestre
Bug 970884 - Fix for intermittent browser_webconsole_bug_589162_css_filter.js | Timed out while waiting for: css error displayed. a=test-only
Bug 944542 - Blocklist spvc32.dll. r=bsmedberg, a=sledru
Bug 970358 - Disable BackgroundHangMonitor on release builds. r=froydnj, a=sledru
Bug 967350 - openSignInAgainPage() now opens about:accounts?action=reauth. r=ttaubert, a=gavin
Bug 967553 - Restore to using __wrap_free. r=gcp, a=sledru
Bug 970485 - Australis widget wrapper's anchor property for API-provided widgets causes exceptions. r=mikedeboer, a=sledru
Bug 965896 - Allow a sync startOver to re-enable Firefox Accounts. r=rnewman, a=gavin
Bug 967047 - Give FxA credentials the same special treatment the legacy sync host credentials get. r=rnewman, a=gavin