Hg fix focus

We were previously patching a Firefox bug to place the selection in the correct place. It turns Chrome >= 38 now has the same behaviour as Firefox so we should always do the patch.

NOTE: That this is just a quickfix (or hotfix @robinedman). Once this has been merged and released I will update the tests and the browser inconsistencies.

\cc @theefer @sihil @robinedman