Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/393c67d505aa
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16893 from chuck-lee/bug-907028_Wifi_Wake_Lock

Bug 979130 - Turn Wifi into power save mode while screen off with wifi lock held.

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https://hg.mozilla.org/integration/gaia-1_4/rev/d8b4e1acbc78
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18492 from justindarc/bug991856-v1.4

Bug 991856 - [Camera][Madai] Implement the new design for the focus ring

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https://hg.mozilla.org/integration/gaia-1_4/rev/7a0ab43c7304
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 991856 - [Camera][Madai] Implement the new design for the focus ring
Bumping manifests a=b2g-bump