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

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https://hg.mozilla.org/integration/gaia-central/rev/486b653a4c77
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1007519 - Perma failing test, toggle calendar > regular event disable calendar day view

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https://hg.mozilla.org/integration/gaia-central/rev/f27468f0c2a4
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #21697 from pivanov/bug-1035726

Bug 1035726 - [Search] - remove unused images

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https://hg.mozilla.org/integration/gaia-central/rev/08169cd68c0e
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1035726 - [Search] - remove unused images
Bumping manifests a=b2g-bump