GitLab

After CL:2454591 the image request task's colorSpace_ member serves no
purpose: remove it.

Bug: 1132695
Change-Id: Ib8e5ff2b8ea4bab388cebd7c3b1cc6f31caa558c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454552
Auto-Submit: Noel Gordon <noel@chromium.org>
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814563}