From device
- Go to chrome://settings/people.
- Click
turn off
sync data. - At the pop up, check into
Clear bookmark, history, password and more from this device
. - Click turn off.
=> all your synced data will be cleared from the device.
From cloud
- Go to https://chrome.google.com/sync.
- You will see analysis about all your synced data
- Scroll down and click to reset.
=> all your synced data will be cleared from chrome sync cloud.