Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3d43c0bce3a9
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17908 from AndreiH/bug991076

Bug 991076 - Xfail test_cost_control_data_alert_mobile failing because B...

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https://hg.mozilla.org/integration/gaia-central/rev/fd0df9a1107e
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 991076 - Xfail test_cost_control_data_alert_mobile failing because Bug 991067
Bumping manifests a=b2g-bump