mozilla/servo — pull request #2432 by SimonSapin (2014-05-14 14:51:24+00:00)
Title: Remove OptNewVector and use Vec instead.

Before we had Vec, Option<~[T]> was used as an optimization of ~[T] to avoid allocating for empty vectors when that was the common case. Vec itself does this optimization, so there is no need for this anymore.

r? @larsbergstrom