Alternatively, find the Bookmarks file (it is just named Bookmarks) that Chrome uses and back it up.
It is usually at:
Once you've reinstalled Chrome you can go to the same location and just copy the file back (over the existing default one).
However if you synchronise Chrome with the online Google service, when you reinstall Chrome on the fresh build it shouuld re-sync automatically. But it certainly would not do any harm to create your own backup as above.
opened hidden folders ok, followed the link in your post, the bookmarks in the default folder would not open so have saved the default folder. so will paste in in the new google and delete or rename the freshinly installed default.