Unreviewed, rolling out r176396.
https://bugs.webkit.org/show_bug.cgi?id=138926

revealed some WebCore::BidiResolver issue. rollout this for
now. (Requested by zalan on #webkit).

Reverted changeset:

"Simple line layout: Introduce text fragment continuation."
https://bugs.webkit.org/show_bug.cgi?id=138274
http://trac.webkit.org/changeset/176396

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@176397 268f45cc-cd09-0410-ab3c-d52691b4dbfc