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

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https://hg.mozilla.org/integration/gaia-central/rev/7e490065de45
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #19714 from elefant/bug/1016866

Bug 1016866 - Always send a notification when captive portal is detected, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/a046a73018f1
Author: hchang <hchang@mozilla.com>
Desc: Bug 1016866 - Always send a notification when captive portal is detected
Bumping manifests a=b2g-bump