Move InvalidationGuard/InstanceUpdateBlocker out of SVGElementInstance

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 8652932cd6194af3aea8506c13f8ffb5053f6625..14ca8b4f3fa277a033266fa03596b34d2de02573 100644
--- a/Source/core/svg/SVGAElement.cpp
+++ b/Source/core/svg/SVGAElement.cpp
@@ -115,7 +115,7 @@ void SVGAElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    SVGElementInstance::InvalidationGuard invalidationGuard(this);
+    SVGElement::InvalidationGuard invalidationGuard(this);
 
     // Unlike other SVG*Element classes, SVGAElement only listens to SVGURIReference changes
     // as none of the other properties changes the linking behaviour for our <a> element.