Enable sticky positioning for table elements.

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
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=166355

[ojan, 2014-01-24 01:29:21]

lgtm

[commit-bot: I haz the power, 2014-01-24 01:29:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sl.ostapenko@samsung.com/143653008/1

[commit-bot: I haz the power, 2014-01-24 03:51:36]

Retried try job too often on linux_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[rwlbuis, 2014-01-27 22:46:25]

It seems hasRelativePosition is not really needed since there is only one
callsite, and other code in rendering calls position() and compares it to an
EPosition value.

[ostap, 2014-01-28 23:24:18]

Similar patch was landed here: http://trac.webkit.org/changeset/162960

[dglazkov, 2014-02-03 22:53:44]

lgtm

[commit-bot: I haz the power, 2014-02-03 22:53:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sl.ostapenko@samsung.com/143653008/220001

[commit-bot: I haz the power, 2014-02-04 05:43:10]

Change committed as 166355