[Tizen IVI] Make HTML5 full screen API work on IVI.

Currently, Crosswalk for Ozone-wayland shows the title bar by default on IVI.
As a result, when webapps enter fullscreen mode using HTML5 fullscreen API,
their title bar still exist.

This patch allows to hide the title bar in fullscreen mode.

Bug: XWALK-896
Merge pull request #138 from joone/XWALK-896_hide_titlebar_rebase

[Tizen IVI] Make HTML5 full screen API work on IVI.