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

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https://hg.mozilla.org/integration/gaia-central/rev/69295b3ba8ca
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #15673 from alivedise/bugzilla/961569/fullscreen-modal-dialog

Bug 961569 - Fix modal dialog under mozfullscreen, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/3d86405ad513
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 961569 - Fix modal dialog under mozfullscreen

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https://hg.mozilla.org/integration/gaia-central/rev/8d669fcdb88a
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #15677 from crdlc/bug-922391

Bug 922391 - [B2g] [E.me] UI overlaps when user tries to delete an app f...

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https://hg.mozilla.org/integration/gaia-central/rev/a606f1ccaad2
Author: crdlc <crdlc@tid.es>
Desc: Bug 922391 - [B2g] [E.me] UI overlaps when user tries to delete an app from the dock area
Bumping manifests a=b2g-bump