code: func (s *ProjectsService) GetCommitContent(projectName, commitID, fileID string) (string, *Response, error) {
  	u := fmt.Sprintf("projects/%s/commits/%s/files/%s/content", url.QueryEscape(projectName), commitID, fileID)
  	return getStringResponseWithoutOptions(s.client, u)
  }
docs: // GetCommitContent gets the content of a file from a certain commit.
  // The content is returned as base64 encoded string.
  //
  // Gerrit API docs: https://gerrit-review.googlesource.com/Documentation/rest-api-projects.html##get-content-from-commit