REGRESSION (r62632): page-break-inside: avoid is ignored

REGRESSION (r62632): page-break-inside: avoid is ignored
https://bugs.webkit.org/show_bug.cgi?id=79262

Reviewed by Adele Peterson.

Source/WebCore:

This was disabled in r62632 because of <http://webkit.org/b/41532>. Changes to the
pagination code since then have invalidated that bug, so enabling the feature again does not
re-introduce the bug.

Updated expected results for printing/page-break-inside-avoid.html.

* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::adjustForUnsplittableChild):

LayoutTests:

* printing/page-break-inside-avoid-expected.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@108528 268f45cc-cd09-0410-ab3c-d52691b4dbfc