The use counter is showing pretty much zero usage of this API, so as a
first step towards removing the implementation of DownloadToFile, this
changes the exposed API to always fail when attempting to use it.
Bug: 823522
Change-Id: Ic82280d3d203684467fa4845b255cff9a02e1e12
Reviewed-on: https://chromium-review.googlesource.com/1062705
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Mark Seaborn <mseaborn@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561682}