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This test installs a MockNetworkChangeNotifier that starts out in the
disconnected state. It then switches to WIFI and ensures
VariationsService did a request.

BUG=826930
TEST=covered by test

Change-Id: I8d193647689e8f67dfc9674bd81bd0d6da9e056b
Reviewed-on: https://chromium-review.googlesource.com/990728
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547741}