<rdar://problem/10156263> ASSERT in WebCore::FrameView::scheduleRelayoutOfSubtree

<rdar://problem/10156263> ASSERT in WebCore::FrameView::scheduleRelayoutOfSubtree

Reviewed by Sam Weinig.

Source/WebCore:

Test: fast/dynamic/subtree-unrooted.html

* rendering/RenderObject.cpp:
(WebCore::RenderObject::scheduleRelayout): Replaced the check that the renderer is parented,
which was added in r21162, with a check that it is “rooted”.

LayoutTests:

* fast/dynamic/subtree-unrooted-expected.txt: Added.
* fast/dynamic/subtree-unrooted.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@95926 268f45cc-cd09-0410-ab3c-d52691b4dbfc