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

Source/core/svg/SVGAElement.cpp

Index: Source/core/svg/SVGAElement.cpp
diff --git a/Source/core/svg/SVGAElement.cpp b/Source/core/svg/SVGAElement.cpp
index 7a37381f818c9a781155de2cb267fbb89b26c584..55101fa14fc5b075c8c6f5ee7fd72d90b7520b36 100644
--- a/Source/core/svg/SVGAElement.cpp
+++ b/Source/core/svg/SVGAElement.cpp
@@ -221,6 +221,18 @@ bool SVGAElement::isKeyboardFocusable() const
     return false;
 }
 
+bool SVGAElement::childShouldCreateRenderer(const Node& child) const
+{
+    // 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.hasTagName(SVGNames::aTag))
+        return false;
+    if (parentNode() && parentNode()->isSVGElement())
+        return toSVGElement(parentNode())->childShouldCreateRenderer(child);
+
+    return SVGGraphicsElement::childShouldCreateRenderer(child);
+}
+
 bool SVGAElement::willRespondToMouseClickEvents()
 {
     return isLink() || SVGGraphicsElement::willRespondToMouseClickEvents();