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Use of gconf has been removed, and we depend on gsettings (in libgio)
instead of dconf directly.

Bug: 768027
Change-Id: Iec222f01577d3ffe10ee4a31345030d765eaefb4
Reviewed-on: https://chromium-review.googlesource.com/827921Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Tim Brown <timbrown@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524227}