Revert of Convert remaining RenderSVG* nodes to RenderObject::isChildAllowed

Source/core/rendering/svg/RenderSVGTransformableContainer.cpp

Index: Source/core/rendering/svg/RenderSVGTransformableContainer.cpp
diff --git a/Source/core/rendering/svg/RenderSVGTransformableContainer.cpp b/Source/core/rendering/svg/RenderSVGTransformableContainer.cpp
index c55400cd13260b9cac3f6efe4f2b8717cf9afef4..e666e2bb71286b7b4fb33d9e33d8f713ed2340da 100644
--- a/Source/core/rendering/svg/RenderSVGTransformableContainer.cpp
+++ b/Source/core/rendering/svg/RenderSVGTransformableContainer.cpp
@@ -37,37 +37,6 @@ RenderSVGTransformableContainer::RenderSVGTransformableContainer(SVGGraphicsElem
 {
 }
 
-static bool hasValidPredecessor(const Node* node)
-{
-    ASSERT(node);
-    while ((node = node->previousSibling())) {
-        if (node->isSVGElement() && toSVGElement(node)->isValid())
-            return true;
-    }
-    return false;
-}
-
-bool RenderSVGTransformableContainer::isChildAllowed(RenderObject* child, RenderStyle* style) const
-{
-    if (element()->hasTagName(SVGNames::switchTag)) {
-        Node* node = child->node();
-        // Reject non-SVG/non-valid elements.
-        if (!node->isSVGElement() || !toSVGElement(node)->isValid())
-            return false;
-        // Reject this child if it isn't the first valid node.
-        if (hasValidPredecessor(node))
-            return false;
-    } else if (element()->hasTagName(SVGNames::aTag)) {
-        // http://www.w3.org/2003/01/REC-SVG11-20030114-errata#linking-text-environment
-        // The 'a' element may contain any element that its parent may contain, except itself.
-        if (child->node()->hasTagName(SVGNames::aTag))
-            return false;
-        if (parent() && parent()->isSVG())
-            return parent()->isChildAllowed(child, style);
-    }
-    return RenderSVGContainer::isChildAllowed(child, style);
-}
-
 bool RenderSVGTransformableContainer::calculateLocalTransform()
 {
     SVGGraphicsElement* element = toSVGGraphicsElement(this->element());