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

Source/core/svg/SVGSwitchElement.cpp

Index: Source/core/svg/SVGSwitchElement.cpp
diff --git a/Source/core/svg/SVGSwitchElement.cpp b/Source/core/svg/SVGSwitchElement.cpp
index 539ef59f991d8a9a9a474993bc21988c8716b08c..e9e3faa8c116679f346c58b8917f2bb7a45a94e1 100644
--- a/Source/core/svg/SVGSwitchElement.cpp
+++ b/Source/core/svg/SVGSwitchElement.cpp
@@ -48,6 +48,26 @@ PassRefPtr<SVGSwitchElement> SVGSwitchElement::create(Document& document)
     return adoptRef(new SVGSwitchElement(document));
 }
 
+bool SVGSwitchElement::childShouldCreateRenderer(const Node& child) const
+{
+    // FIXME: This function does not do what the comment below implies it does.
+    // It will create a renderer for any valid SVG element children, not just the first one.
+    bool shouldCreateRenderer = false;
+    for (Node* node = firstChild(); node; node = node->nextSibling()) {
+        if (!node->isSVGElement())
+            continue;
+
+        SVGElement* element = toSVGElement(node);
+        if (!element || !element->isValid())
+            continue;
+
+        shouldCreateRenderer = node == &child; // Only allow this child if it's the first valid child.
+        break;
+    }
+
+    return shouldCreateRenderer && SVGGraphicsElement::childShouldCreateRenderer(child);
+}
+
 RenderObject* SVGSwitchElement::createRenderer(RenderStyle*)
 {
     return new RenderSVGTransformableContainer(this);