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

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https://hg.mozilla.org/integration/gaia-central/rev/1a0415682d0b
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22341 from mancas/bug929311

Bug 929311 - Should provide more suitable description while user want to...

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https://hg.mozilla.org/integration/gaia-central/rev/e34eb367c67e
Author: Manuel Casas Barrado <b.mcb@tid.es>
Desc: Bug 929311 - Should provide more suitable description while user want to download the updates in roaming area.

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https://hg.mozilla.org/integration/gaia-central/rev/ad55dd0497df
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #23199 from vingtetun/add.back.white

Bug 1050723 - Reduce overpaint of the dialer app. followup. r=me

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https://hg.mozilla.org/integration/gaia-central/rev/169250d6724d
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1050723 - Reduce overpaint of the dialer app. followup. r=me
Bumping manifests a=b2g-bump