code: function (path, options) {
      const fullPath = googleDrivePath(path);
  
      return this._getFileId(fullPath).then((id) => {
        if (!id) {
          // File doesn't exist. Ignore.
          return Promise.resolve({statusCode: 200});
        }
  
        return this._getMeta(id).then((meta) => {
          let etagWithoutQuotes;
          if ((typeof meta === 'object') && (typeof meta.etag === 'string')) {
            etagWithoutQuotes = removeQuotes(meta.etag);
          }
          if (options && options.ifMatch && (options.ifMatch !== etagWithoutQuotes)) {
            return {statusCode: 412, revision: etagWithoutQuotes};
          }
  
          return this._request('DELETE', BASE_URL + '/drive/v2/files/' + id, {}).then((response) => {
            if (response.status === 200 || response.status === 204) {
              return {statusCode: 200};
            } else {
              return Promise.reject("Delete failed: " + response.status + " (" + response.responseText + ")");
            }
          });
        });
      });
    }
docs: Delete a file.
  
  @param {string} path - File path
  @param {Object} options
  @param {string} options.ifMatch - only delete the file if it's ETag
  matches this string
  @returns {Promise} Resolves with an object containing the status code
  
  @protected