Don't move uneditable style and link elements during deletion

Source/core/editing/DeleteSelectionCommand.cpp

Index: Source/core/editing/DeleteSelectionCommand.cpp
diff --git a/Source/core/editing/DeleteSelectionCommand.cpp b/Source/core/editing/DeleteSelectionCommand.cpp
index 38d9f4429d437420ee2e6bb6caad01ad30bbe4df..868e60ab2be2dd28f78665b3d234ddd0f667b503 100644
--- a/Source/core/editing/DeleteSelectionCommand.cpp
+++ b/Source/core/editing/DeleteSelectionCommand.cpp
@@ -427,8 +427,10 @@ void DeleteSelectionCommand::makeStylingElementsDirectChildrenOfEditableRootToPr
         if ((node->hasTagName(styleTag) && !(toElement(node.get())->hasAttribute(scopedAttr))) || node->hasTagName(linkTag)) {
             nextNode = NodeTraversal::nextSkippingChildren(node.get());
             RefPtr<ContainerNode> rootEditableElement = node->rootEditableElement();
-            removeNode(node);
-            appendNode(node, rootEditableElement);
+            if (rootEditableElement.get()) {
+                removeNode(node);
+                appendNode(node, rootEditableElement);
+            }
         }
         node = nextNode;
     }