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

Source/core/rendering/svg/RenderSVGTSpan.h

Index: Source/core/rendering/svg/RenderSVGTSpan.h
diff --git a/Source/core/rendering/svg/RenderSVGTSpan.h b/Source/core/rendering/svg/RenderSVGTSpan.h
index e6826b7abf1102e22443b3d83a553435abd644de..7875119a34fdc6992fec1c19b95aeb31c3fbb1a3 100644
--- a/Source/core/rendering/svg/RenderSVGTSpan.h
+++ b/Source/core/rendering/svg/RenderSVGTSpan.h
@@ -28,6 +28,9 @@ namespace WebCore {
 class RenderSVGTSpan FINAL : public RenderSVGInline {
 public:
     explicit RenderSVGTSpan(Element*);
+
+    virtual bool isChildAllowed(RenderObject* child, RenderStyle*) const OVERRIDE;
+
     virtual const char* renderName() const OVERRIDE { return "RenderSVGTSpan"; }
 };
 }