Enable sticky positioning for table elements.

Also includes fix for bug ​https://bugs.webkit.org/show_bug.cgi?id=105654
I don't have access to this bug, but from commit message I assume it says about "Heap use after free problem".
Debugging showed that it wasn't heap use after free. The real problem that RenderObject::container() returns object which is not RenderBlock and it is used as RenderBlock in
RenderBox::containingBlockLogicalHeightForPositioned() method.

BUG=231751

Review URL: https://codereview.chromium.org/143653008

git-svn-id: svn://svn.chromium.org/blink/trunk@166355 bbb929c8-8fbe-4397-9dbb-9b2b20218538