(no bug) fix dos-style line-endings in browser.css. a=whitespace-only
Bug 1093316 part 1: Backout changeset aece7f9f944c (i.e. backout bug 1032922 part 2), to reflect CSSWG removing "flex-basis: main-size" from the flexbox spec. a=lsblakk
Bug 1093316 part 2: Backout changeset af2a4fb980ad (i.e. backout bug 1032922 part 1), to reflect CSSWG removing "flex-basis: main-size" from the flexbox spec. a=lsblakk