Bookmarks WebUI: fix toast duration

I change the value for testing and submitted the change.

https://chromium-review.googlesource.com/c/chromium/src/+/1935930

Bug: 1030181
Change-Id: I3c1f4e83bf9acc84ebfce32564b6568a361526bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1963199
Commit-Queue: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Auto-Submit: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724065}

chrome/browser/resources/bookmarks/app.html

@@ -78,7 +78,7 @@
 </div>
 <bookmarks-router></bookmarks-router>
 <bookmarks-command-manager></bookmarks-command-manager>
-<cr-toast-manager duration="100000000">
+<cr-toast-manager duration="10000">
   <dom-if>
     <template>
       <cr-button on-click="onUndoClick_" aria-label="$i18n{undoDescription}">