Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/684a19da3579
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #19677 from chirarobert/wifi_manager

Bug 985558 - Make is_wifi_enabled handle mozWifiManager states

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https://hg.mozilla.org/integration/gaia-central/rev/277795780ee4
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 985558 - Make is_wifi_enabled handle mozWifiManager states

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https://hg.mozilla.org/integration/gaia-central/rev/dbc0cb61c5fb
Author: gitmai <mri@tid.es>
Desc: Merge pull request #18981 from vsireesha246/Bug_1003049_Usage_Graph_moves_continuously

[Costcontrol] Bug 1003049 - [Costcontrol]The Usage line(Green/red) moves continuously ...r=lodr

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https://hg.mozilla.org/integration/gaia-central/rev/60eba747d731
Author: varada.sireesha <varada.sireesha@lge.com>
Desc: Bug 1003049 - [Costcontrol]The Usage line(Green/red) moves continuously if user selects the Reset Report(Monthly,Weekly,Never) randomly
Bumping manifests a=b2g-bump