RenderTableCellDeathTest unit test fails on mac
https://bugs.webkit.org/show_bug.cgi?id=110992

Unreviewed revert of all changes. The problem seems to have resolved.

* tests/RenderTableCellTest.cpp: Remove Mac disable code.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144303 268f45cc-cd09-0410-ab3c-d52691b4dbfc