[RAL] Fix LayoutState for AbsPos elements inside RelPos inline blocks

If we have an absolutely positioned element inside a relatively
positioned inline block we, currently, need to disable LayoutState
as we'll invalidate the object incorrectly otherwise.

With non-Repaint-After-Layout these elements would have
been invalidated by the RenderLayerRepainter which does
not use LayoutState.

BUG=370945

Review URL: https://codereview.chromium.org/272503008

git-svn-id: svn://svn.chromium.org/blink/trunk@173779 bbb929c8-8fbe-4397-9dbb-9b2b20218538