chromium/chrome/test/data/extensions/api_test/permissions/favicon/manifest.json

{
  "name": "favicon test",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Tests that we can load favicon images.",
  "background": {
    "page": "test.html"
  },
  "permissions": ["chrome://favicon/"]
}