Add support for the new "unix" editing behavior.
Add support for the new "unix" editing behavior.

BUG=none
TEST=none; the layout test that will use this will come soon.


Review URL: http://codereview.chromium.org/4886003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@65957 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser