Watch the video:
Timestamps:
0:00 - Explanation
0:56 - Fix 1: Simple restart
1:08 - Missing extensions
1:27 - Fix 2: Turn sync on (or off and on)
2:18 - Syncing again
4:02 - MIssing download history (It's not synced)
5:00 - Fix 3: Reinstalling Chrome (Last resort)
Reinstalled Google Chrome, or just had to log in again? Things missing? Well, you’re not alone, this does happen sometimes. This video shows you how to go about fixing missing extensions, history, settings and other things that should be synced when you sign in to your Google account. By the end, you should have everything back in working order.
Download Chrome: https://www.google.com/chrome/