Google Calendar: Add AND remove calendars

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Google Calendar: Add AND remove calendars",
  "description": "Chrome extension to turn the \"Add a coworker's calendar\" field in Google Calendar into a toggle for adding AND removing calendars.",
  "version": "0.1",
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/calendar/*",
        "http://www.google.com/calendar/*"
      ],
      "js": [
        "node_modules/email-addresses/lib/email-addresses.js",
        "node_modules/underscore/underscore.js",
        "index.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "https://www.google.com/calendar/*"
  ],
  "icons": {
    "128": "icon128.png"
  },
  "manifest_version": 2
}