WebUI NTP: fix closure error in utils

Bug: 1047811
Change-Id: I0fd7bbc18752122ba1bc415fc41f98298a92da7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033911
Commit-Queue: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Auto-Submit: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737555}

chrome/browser/resources/new_tab_page/utils.js

@@ -23,7 +23,7 @@ export function skColorToRgb(skColor) {
 /**
  * Converts a string of the form "#rrggbb" to an SkColor object.
  * @param {string} hexColor The color string.
- * @return {skia.mojom.SkColor} The SkColor object,
+ * @return {!skia.mojom.SkColor} The SkColor object,
  */
 export function hexColorToSkColor(hexColor) {
   if (!/^#[0-9a-f]{6}$/.test(hexColor)) {