RenderBox::requiresLayer() should share code with superclass

https://bugs.webkit.org/show_bug.cgi?id=268937
rdar://122490562

Reviewed by Simon Fraser.

The `RenderBox::requiresLayer()` method duplicates code found in its superclass.
We now call `RenderBoxModelObject::requiresLayer()` instead.

* Source/WebCore/rendering/RenderBox.cpp:
(WebCore::RenderBox::requiresLayer const):

Canonical link: https://commits.webkit.org/274270@main

Source/WebCore/rendering/RenderBox.cpp

@@ -5842,8 +5842,7 @@ std::optional<LayoutUnit> RenderBox::explicitIntrinsicInnerHeight() const
 // position:static elements that are not flex-items get their z-index coerced to auto.
 bool RenderBox::requiresLayer() const
 {
-    return isDocumentElementRenderer() || isPositioned() || createsGroup() || hasNonVisibleOverflow()
-        || hasTransformRelatedProperty() || hasHiddenBackface() || hasReflection() || style().specifiesColumns()
+    return RenderBoxModelObject::requiresLayer() || hasNonVisibleOverflow() || style().specifiesColumns()
         || style().containsLayout() || !style().hasAutoUsedZIndex() || hasRunningAcceleratedAnimations();
 }