[CSS Shapes] Floats with shape-outside aren't painting in the correct order

[CSS Shapes] Floats with shape-outside aren't painting in the correct order
https://bugs.webkit.org/show_bug.cgi?id=118492

Reviewed by Darin Adler.

Source/WebCore:

When removing the old positioning behavior, the code that makes a
float with shape-outside gain a layer was left behind. This patch
removes that, so now floats with shape-outside are painted just like
floats without shape-outside.

Also remove the isFloatingWithShapeOutside helper method because its
use is now somewhat redundant, and the check it does is now only
needed in one place.

Test: fast/shapes/shape-outside-floats/shape-outside-floats-not-a-layer.html

* rendering/RenderBox.h:
(WebCore::RenderBox::shapeOutsideInfo):
* rendering/RenderObject.h:
* rendering/shapes/ShapeOutsideInfo.cpp:
(WebCore::ShapeOutsideInfo::isEnabledFor):

LayoutTests:

Update tests to reflect correct painting order. Add a new test for the
correct painting behavior.

* csswg/submitted/shapes/shape-outside/shape-outside-floats-circle-000-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-circle-000.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-ellipse-000-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-ellipse-000.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-inset-rectangle-001-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-inset-rectangle-001.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-001-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-001.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-002-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-002.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-003-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-003.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-004-expected.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-rounded-rectangle-004.html:
* csswg/submitted/shapes/shape-outside/shape-outside-floats-stacked-000.html:
* fast/shapes/shape-outside-floats/shape-outside-floats-not-a-layer-expected.html: Added.
* fast/shapes/shape-outside-floats/shape-outside-floats-not-a-layer.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@155244 268f45cc-cd09-0410-ab3c-d52691b4dbfc