GitLab

We want to be able to DCHECK that all requests have a non-empty
IsolationInfo, and it's safest to just separate out these fetches,
rather than reuse something else's IsolationInfo.

Bug: 1082280
Change-Id: Ib734910cc16a555673e4127317d05d80ca119f72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212442Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771895}