Bug 889219. Part 1: Clean up nsPrintEngine string usage for document titles/URLs. r=mats,a=bajaj
Backed out changeset 5a6f73ab541d
Bug 886576 - Fix scrolling cancelling locked dynamic toolbar animations. r=kats, a=lsblakk

Move the margin animation-cancelling call into the margins-pinned check block
in LayerMarginsAnimator to make sure margin animations aren't cancelled by
scrolling when margins are locked.
Bug 895023 - Null-check SVG image document's root frame, before dereferencing it. r=seth, a=lsblakk