The Google Dashboard gives an overview of the data associated with your Google Account. This includes the bookmarks, stored password, apps , custom settings, synced data..etc. To access the Google Dashboard from Google Chrome follow the below procedure:
Open Google Chrome and sign-in to yout Google Account.
Click the button named "Customize and control Google Chrome" > Settings.
The dashboard shall open:
You can clear the synced data by clicking on the Stop and Clear button.