This file is indexed.

/usr/lib/chromium-browser/master_preferences is in ubuntu-mate-default-settings 18.04.17.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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{
  "homepage" : "https://start.ubuntu-mate.org",
  "homepage_is_newtabpage" : false,
  "browser": {
    "show_home_button": true
  },
  "distribution" : {
    "skip_first_run_ui" : true,
    "show_welcome_page" : false
  },
  "first_run_tabs": [
    "https://start.ubuntu-mate.org",
    "http://welcome_page"
  ],
  "session": {
    "restore_on_startup": 1
  },
  "sync_promo": {
    "show_on_first_run_allowed": false
  }
}