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When the Network Service is enabled, LBS failed to download sitelists
for file:// URLs. This CL fixes the issue.

Bug: 936160
Change-Id: Iae19b7d9798236f35f7a8c525569b4cb241296c5
Reviewed-on: https://chromium-review.googlesource.com/c/1495575
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636912}