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

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https://hg.mozilla.org/integration/gaia-central/rev/526ae5cabe8c
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #25611 from chirarobert/browser_save_image

Bug 1090087 - Add test for saving an image from a webpage

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https://hg.mozilla.org/integration/gaia-central/rev/23d8145203c4
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1090087 - Add test for saving an image from a webpage
Bumping manifests a=b2g-bump