We don't have any API that calls setPagination. This was from
Apple's use of WebKit. 

With setPagination gone, we no longer need to keep bits on both
Page and FrameView for pagination. We just keep the FrameView one,
which you can actually set via CSS (i.e. see
FrameView::applyPaginationToViewport).

Also, fixes a bug in paginationModeForRenderStyle to keep the
tests passing.

I changed fast/multicol/hit-test-gap-between-pages-flipped.html a bit
so that it would still spit out PASS even though I believe it now
exposes a bug in caretRangeFromPoint combined with pagination
and horizontal-bt writing mode.

Finally, the virtual calcColumnWidth can be removed as the version
in RenderBlock works for the RenderView now.

Review URL: https://codereview.chromium.org/150413007

git-svn-id: svn://svn.chromium.org/blink/trunk@166475 bbb929c8-8fbe-4397-9dbb-9b2b20218538