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These factories don't support download_to_file anyway, so make sure
nobody is trying to call them with download_to_file set to true.

Also fix the one place where download_to_file was set to true despite
the code not actually expecting the callbacks that that should result
in, if download_to_file would have been implemented.

Bug: 791702
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I2f31d2a45c59ba4b15e92cfe18718ed4eb69847b
Reviewed-on: https://chromium-review.googlesource.com/957708Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542869}