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

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https://hg.mozilla.org/integration/gaia-central/rev/0d6460039e94
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20529 from KevinGrandon/bug_1025564_vertical_edit_mode_transition

Bug 1025564 - Remove 'dragging' class on transitionend to allow icon drop transitions.

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https://hg.mozilla.org/integration/gaia-central/rev/7d2ef2d5ffb9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1025506 - Disable test, homescreen tests should not rely on dom order r=me

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https://hg.mozilla.org/integration/gaia-central/rev/39412c235109
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1025564 - Remove 'dragging' class on transitionend to allow icon drop transitions. r=kgrandon
Bumping manifests a=b2g-bump