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

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https://hg.mozilla.org/integration/gaia-2_1/rev/9dd889687b58
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1063228 - [Rocketbar] Fix race conditions with active flag r=apastor

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https://hg.mozilla.org/integration/gaia-2_1/rev/776f7c539e42
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1046202 - Copy improvement when battery is almost empty

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https://hg.mozilla.org/integration/gaia-2_1/rev/b6d0f67bb6e0
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1059932 - [Status Bar] Increase priority of download indicator

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https://hg.mozilla.org/integration/gaia-2_1/rev/2cbbd9d5ff91
Author: crdlc <crdlc@tid.es>
Desc: Bug 1059902 - Swap order of cost control widgets in Utility tray
Bumping manifests a=b2g-bump