GitLab

GenericURLRequestJob already reads cookies, but it didn't write them.

Bug: 
Change-Id: I2b3b93d652e8c3a79c6f8bb854b0ddec84fe1a93
Reviewed-on: https://chromium-review.googlesource.com/848993Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526676}