Remove overflow dead code
https://bugs.webkit.org/show_bug.cgi?id=115893

Reviewed by Antti Koivisto.

The patch removes unused public overflow accesor functions from RenderOverflow and InlineFlowBox.

Tests: no tests, code cleanup.

* rendering/InlineFlowBox.h: Removed logicalLeftLayoutOverflow and logicalRightLayoutOverflow.
* rendering/RenderOverflow.h: Removed setMinYLayoutOverflow, setMaxYLayoutOverflow,
    setMinXLayoutOverflow, setMaxXLayoutOverflow, setMinYVisualOverflow, setMaxYVisualOverflow,
    setMinXVisualOverflow and setMaxXVisualOverflow.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149867 268f45cc-cd09-0410-ab3c-d52691b4dbfc