mozilla/servo — pull request #2130 by mbrubeck (2014-04-16 16:30:35+00:00)
Title: Remove unintentional copies due to RefCell<T>::get

We are calling `get` when we should call `borrow` or `borrow_mut`. This is causing bugs with iframes because we append the child frame to a copy of the parent's `children` vector rather than the original.

r? @larsbergstrom