Backed out changeset f21da1055c46 (bug 835698) a=bustage_from_bug_839688
Backed out changeset 1a2e34c9ebc7 (bug 835698) a=bustage_from_bug_839688
Merge the last PGO-green inbound changeset to m-c.
Merge m-c to inbound.
Bug 769178 - Add error page for about:certerror. r=fabrice
Bug 839627 - Update pdf.js to version 0.7.210. r=yury
Bug 837037: don't pass the NrIceCtx to IceGathering runnables r=ekr