private VcsAbstractHistorySession createSession(final FilePath filePath, final List<? extends VcsFileRevision> revisions,
                                                  final @Nullable VcsRevisionNumber number) {
    return new GitHistorySession(filePath, number, revisions);
  }
private VcsAbstractHistorySession createSession(final FilePath filePath, final List<? extends VcsFileRevision> revisions,
                                                  final @Nullable VcsRevisionNumber number)