[cleanup] Use GetUploadData from services/network/test/ where appropriate

Change-Id: Icc9786d1f484687e9488bf565893afe023e2b40a
Reviewed-on: https://chromium-review.googlesource.com/1135297
Commit-Queue: Doug Turner <dougt@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575836}
3 files changed