Update <use> trees when the referenced element is changed.

Source/core/svg/SVGElementInstance.cpp

Index: Source/core/svg/SVGElementInstance.cpp
diff --git a/Source/core/svg/SVGElementInstance.cpp b/Source/core/svg/SVGElementInstance.cpp
index c735d82990ff5a27384d8646b803cb27d2d93bac..ad2a5bc6d107b9ac8d43062e7d58a0eee8b53470 100644
--- a/Source/core/svg/SVGElementInstance.cpp
+++ b/Source/core/svg/SVGElementInstance.cpp
@@ -171,7 +171,7 @@ void SVGElementInstance::appendChild(PassRefPtr<SVGElementInstance> child)
 
 void SVGElementInstance::invalidateAllInstancesOfElement(SVGElement* element)
 {
-    if (!element || !element->inDocument())
+    if (!element)
         return;
 
     if (element->instanceUpdatesBlocked())
@@ -195,8 +195,6 @@ void SVGElementInstance::invalidateAllInstancesOfElement(SVGElement* element)
             element->invalidateShadowTree();
         }
     }
-
-    element->document().updateRenderTreeIfNeeded();
 }
 
 const AtomicString& SVGElementInstance::interfaceName() const