<br> nodes should not be allowed within SVG text

Source/core/rendering/svg/SVGRenderSupport.h

Index: Source/core/rendering/svg/SVGRenderSupport.h
diff --git a/Source/core/rendering/svg/SVGRenderSupport.h b/Source/core/rendering/svg/SVGRenderSupport.h
index 4265f64c780192db1ea311b53f9d0ce82c066f99..cf5a0056b6ca9fde95d4fa9cce3217118a660e30 100644
--- a/Source/core/rendering/svg/SVGRenderSupport.h
+++ b/Source/core/rendering/svg/SVGRenderSupport.h
@@ -84,6 +84,10 @@ public:
     // Helper method for determining whether an RenderSVGInlineText object has zero length text.
     static bool isEmptySVGInlineText(const RenderObject*);
 
+    // Helper method for determining if a RenderObject marked as text (isText()== true)
+    // can/will be rendered as part of a <text>.
+    static bool isRenderableTextNode(const RenderObject*);
+
 private:
     // This class is not constructable.
     SVGRenderSupport();