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

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https://hg.mozilla.org/integration/gaia-central/rev/dba1360f648b
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #20495 from pivanov/bug-1021271

Bug 1021271 - Status Bar needs refinement for 1.5x Scale and New Homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/a09640cf91eb
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1021271 - Status Bar needs refinement for 1.5x Scale and New Homescreen
Bumping manifests a=b2g-bump