Update Length prettyprinter to current code

The length type enum has changed since this code was written.

R=tzik@chromium.org

Change-Id: I24a294968d3c4157be41e6a597c78cc731fa868d
Reviewed-on: https://chromium-review.googlesource.com/1135907
Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575544}
1 file changed