GitLab

Fixes crrev.com/c/2337411 which inadvertently changed file scheme
downloads to only work when a RenderFrameHost exists.

Bug: 1106995
Change-Id: I9f87c6c2b1b8719e1c78b2aa670b02ff8ac65381
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397041Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805070}