https://bugs.webkit.org/show_bug.cgi?id=115687

Reviewed by David Hyatt.

Source/WebCore:

Remove a simple subset of anonymous wrappers, i.e. anonymous blocks without continuations,
when a block becoming float or positioned removes the need for them.

Test: fast/block/remove-anonymous-wrappers-when-element-changes-to-float-or-positioned.html

* rendering/RenderBlock.h:
(RenderBlock):
* rendering/RenderObject.cpp:
(WebCore):
(WebCore::RenderObject::removeAnonymousWrappersFromLineIfNecessary):
(WebCore::RenderObject::styleWillChange):
(WebCore::RenderObject::styleDidChange):
* rendering/RenderObject.h:
(RenderObject):

LayoutTests:

* fast/block/remove-anonymous-wrappers-when-element-changes-to-float-or-positioned-expected.txt: Added.
* fast/block/remove-anonymous-wrappers-when-element-changes-to-float-or-positioned.html: Added.
* platform/qt/fast/block/float/float-not-removed-from-next-sibling2-expected.txt:
* platform/qt/fast/dynamic/002-expected.txt:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150527 268f45cc-cd09-0410-ab3c-d52691b4dbfc