/ libcef/browser/extensions/chrome_api_registration.cc.

{
  // From chrome/common/extensions/api/_api_features.json.
  // Required by the PDF extension which is hosted in a guest view.
  "contentSettings": {
    "dependencies": ["permission:contentSettings"],
    "contexts": ["privileged_extension"]
  },
  "mimeHandlerViewGuestInternal": {
    "internal": true,
    "contexts": "all",
    "channel": "stable",
    "matches": ["<all_urls>"]
  },
  "pdfViewerPrivate": {
    "dependencies": ["permission:pdfViewerPrivate"],
    "contexts": ["privileged_extension"]
  },
  "resourcesPrivate": [
    {
      "dependencies": ["permission:resourcesPrivate"],
      "contexts": ["privileged_extension"]
    },
    {
      "channel": "stable",
      "contexts": ["webui"],
      "matches": ["chrome://print/*"]
    }
  ],
  "tabs": {
    "channel": "stable",
    "extension_types": ["extension", "legacy_packaged_app"],
    "contexts": ["privileged_extension"],
    "disallow_for_service_workers": false
  }
}