Typecheck JS files for chrome://history

ui/webui/resources/js/util.js

Index: ui/webui/resources/js/util.js
diff --git a/ui/webui/resources/js/util.js b/ui/webui/resources/js/util.js
index 0c92e473dfa12d8842a47d93ad45e9af2ef70122..7c0be72ad5438f1ee893cfe4af54098233010088 100644
--- a/ui/webui/resources/js/util.js
+++ b/ui/webui/resources/js/util.js
@@ -168,14 +168,14 @@ function setQueryParam(location, key, value) {
 }
 
 /**
- * @param {Node} el An element to search for ancestors with |className|.
+ * @param {Element} el An element to search for ancestors with |className|.
  * @param {string} className A class to search for.
- * @return {Node} A node with class of |className| or null if none is found.
+ * @return {Element} A node with class of |className| or null if none is found.
  */
 function findAncestorByClass(el, className) {
-  return findAncestor(el, function(el) {
+  return /** @type {Element} */(findAncestor(el, function(el) {
     return el.classList && el.classList.contains(className);
-  });
+  }));
 }
 
 /**