[Editing][CodeHealth] Make Node::rootEditableElement static

third_party/WebKit/Source/core/editing/VisibleSelection.cpp

Index: third_party/WebKit/Source/core/editing/VisibleSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
index 6bc2b816ec85912f6aa16b91598d0f7f829f08d4..5684cc449fb9ffecf989971f39f5394245b9758f 100644
--- a/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleSelection.cpp
@@ -588,7 +588,7 @@ static Element* lowestEditableAncestor(Node* node)
 {
     while (node) {
         if (node->hasEditableStyle())
-            return node->rootEditableElement();
+            return rootEditableElement(*node);
         if (isHTMLBodyElement(*node))
             break;
         node = node->parentNode();