*** Reason for rollback ***

BidiFormatter should remain immutable.

*** Original change description ***

A few small changes to BidiFormatter. Mainly, it now uses DirectionEstimator that can be modified instead of the constant estimating function of BidiUtils.

Review by: aharon@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9248 8db76d5a-ed1c-0410-87a9-c151d255dfc7