length != offset.

Bug: chromium:718285
Change-Id: I150af1473cb5180c242f3817b940fa1cf1c49cea
Reviewed-on: https://chromium-review.googlesource.com/497727
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45121}