remove dead code

x-pack/plugins/security_solution/public/resolver/lib/tree_sequencers.ts

@@ -4,20 +4,6 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-/**
- * Sequences a tree, yielding children returned by the `children` function. Sequencing is done in 'depth first preorder' fashion. See https://en.wikipedia.org/wiki/Tree_traversal#Pre-order_(NLR)
- */
-export function* depthFirstPreorder<T>(root: T, children: (parent: T) => T[]): Iterable<T> {
-  const nodesToVisit = [root];
-  while (nodesToVisit.length !== 0) {
-    const currentNode = nodesToVisit.shift();
-    if (currentNode !== undefined) {
-      nodesToVisit.unshift(...(children(currentNode) || []));
-      yield currentNode;
-    }
-  }
-}
-
 /**
  * Sequences a tree, yielding children returned by the `children` function. Sequencing is done in 'level order' fashion.
  */