master_preferences and Clear Browsing Data on Exit

Le_Michel 

Hello,

You must enable the data cleanup and select what do you want to clear.

"browser": {
        ...
        "clear_data": {
            "on_exit_succeeded": false
        },
        "clear_data_on_exit": {
            "browsing_history": true,
            "cache": true,
            "cookies": true,
            "download_history": true,
            "form_data": true,
            "hosted_apps_data": true,
            "passwords": true
        },
        ...
}

It is work for me.

BR