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

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https://hg.mozilla.org/integration/gaia-central/rev/7cea69e7b4d2
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #16799 from vingtetun/bug978687

Bug 978687 - Pressing the 'home' button when the utility tray is opened,...

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https://hg.mozilla.org/integration/gaia-central/rev/362cb2cc7179
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 978687 - Pressing the 'home' button when the utility tray is opened, hide the utility tray and pan the homescreen. r=etienne
Bumping manifests a=b2g-bump