Convert SVG <text> and descendants to use RenderObject::isChildAllowed

Source/core/svg/SVGTextElement.h

Index: Source/core/svg/SVGTextElement.h
diff --git a/Source/core/svg/SVGTextElement.h b/Source/core/svg/SVGTextElement.h
index eb8014406034eed1527ee80c879eddf5231bbf11..da4059aaf109cacc9112492d6d2f5721d036a78f 100644
--- a/Source/core/svg/SVGTextElement.h
+++ b/Source/core/svg/SVGTextElement.h
@@ -38,7 +38,7 @@ private:
     virtual bool supportsFocus() const OVERRIDE { return hasFocusEventListeners(); }
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
-    virtual bool childShouldCreateRenderer(const Node& child) const OVERRIDE;
+    virtual bool childShouldCreateRenderer(const Node& child) const OVERRIDE { return true; }
 };
 
 DEFINE_NODE_TYPE_CASTS(SVGTextElement, hasTagName(SVGNames::textTag));