src/googledrive.js
function unHookGetItemURL (rs) {
  if (!rs._origBaseClientGetItemURL) { return; }
  BaseClient.prototype.getItemURL = rs._origBaseClientGetItemURL;
  delete rs._origBaseClientGetItemURL;
}
function unHookGetItemURL (rs) {
  if (!rs._origBaseClientGetItemURL) { return; }
  BaseClient.prototype.getItemURL = rs._origBaseClientGetItemURL;
  delete rs._origBaseClientGetItemURL;
}
Restore BaseClient's getItemURL original implementation

@param {object} rs - RemoteStorage instance

@private