Fixes rietveld issue 403: incorrect side-by-side diff in some cases.
Fixes rietveld issue 403: incorrect side-by-side diff in some cases.

See bug report: http://code.google.com/p/rietveld/issues/detail?id=403

R=maruel@chromium.org
BUG=403

Author: macourteau@chromium.org

Review: https://codereview.appspot.com/7312077/

riannucci/rietveldv2,riannucci/rietveldv2