Scripting

I've created a custom master_preferences file and can deploy it with the MSI install without issue.  The problem is that I can't seem to skip the first run Google "Sign In" page.  If I click on the "Skip sign in", close Chrome and open Chrome again - I can see all my customisations.

Here is my master_preferences file:

{ 
    "homepage" : "http://Intranet/Pages/Home.aspx",
    "homepage_is_newtabpage" : false,
    "browser" : {
        "show_home_button" : true,
        "check_default_browser" : false,
        "window_placement": {
              "bottom": 1000,
              "left": 10,
              "maximized": true,
              "right": 904,
              "top": 10,
              "work_area_bottom": 1010,
              "work_area_left": 0,
              "work_area_right": 1680,
              "work_area_top": 0
        }
    },
    "bookmark_bar" : {
        "show_on_all_tabs" : true
    },
    "distribution" : {
        "skip_first_run_ui" : true,
        "show_welcome_page" : false,
        "import_search_engine" : false,
        "import_history" : false,
        "create_all_shortcuts" : false,
        "do_not_launch_chrome" : true,
        "make_chrome_default" : false
    }
}

Can anyone point to wait I have missed or misconfigured?

Thanks.