Move the table death tests to core/rendering/

Those tests were added to web/tests as this was the only way
to test them at the time. They can now use DummyPageHolder and
be moved to core/rendering where they belong.

Review URL: https://codereview.chromium.org/361633003

git-svn-id: svn://svn.chromium.org/blink/trunk@177177 bbb929c8-8fbe-4397-9dbb-9b2b20218538