Duplicate folders created after import and resync

[LaurenWags]

Description: Duplicate folders for imported data are displayed after sync reset, importing, and turning sync on again.

Steps to reproduce:

1. clean install of brave
2. open and go to Preferences > General > Import Browser Data.
3. Import Browser data from Chrome.
4. Once import is successful, go to Preferences > Sync > I am new to Sync.
5. Enable Sync.
6. Go to Preferences > General > Import Browser Data.
7. Import data from Firefox.
8. Once import is successful, go to Preferences > Sync > Reset Sync.
9. Reset Sync.
10. Right click on each of the folders on the Bookmarks Toolbar and delete the folder.
11. go to Preferences > General > Import Browser Data.
12. Import Browser data from Chrome.
13. Once import is successful, go to Preferences > Sync > I am new to Sync.
14. Enable Sync.
15. Wait a few minutes (2-5).
16. Import folder (Chrome) is duplicated. Screenshots below.