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Also update the "Notes for other distros" in the build instructions.

All usages of gconf has been removed, and we depend on gsettings, not
dconf directly.

This is the final step in switching from gconf to gsettings.

Bug: 768027
Change-Id: I4430c261ac2c9691838e7dfe9c0d7c6842fa535f
Reviewed-on: https://chromium-review.googlesource.com/831106Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Tim Brown <timbrown@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524503}