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

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https://hg.mozilla.org/integration/gaia-central/rev/ce29ee9e45ba
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 971497 - [System2] Instantiable HomeGesture r=alive"

This reverts commit aca50fb3c70966b5f0ec1e808a0174eb34fe83ac.

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https://hg.mozilla.org/integration/gaia-central/rev/7accebf88df3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17005 from KevinGrandon/bug_971497_system2_home_gesture

Bug 971497 - [System2] Instantiable HomeGesture r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/b2e3f17e79d1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971497 - [System2] Instantiable HomeGesture r=alive
Bumping manifests a=b2g-bump