Use tighter InlineBox subtypes in some places.
<https://webkit.org/b/123980>
RenderLineBreak and RenderBox line box wrappers are always going to
be InlineElementBox, so codify this with tighter types. Also made
the various positionLine() functions take tighter reference types.
All the casting to renderer-appropriate box types happens inside of
RenderBlockFlow::computeBlockDirectionPositionsForLine() and
propagates from there.
Reviewed by Antti Koivisto.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158842 268f45cc-cd09-0410-ab3c-d52691b4dbfc
14 files changed
