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Enabled on trunk since the UMA-over-HTTP experiment will now
be ramped to enabled at 1% on stable, and Variations-over-HTTP will
be set to disabled at 1% on all channels. Also added a testing config
for VariationsHttpDisabled.

Bug: 766233
Change-Id: Ie19f57ef7b5535d389d05e277652ff888818d006
Reviewed-on: https://chromium-review.googlesource.com/990086Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547530}