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

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https://hg.mozilla.org/integration/gaia-central/rev/98e9d3640e61
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #25699 from viorelaioia/bug_1092154

Bug 1092154 - Fix failure in test_browser_save_image.py

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https://hg.mozilla.org/integration/gaia-central/rev/6510382e069e
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1092154 - Fix failure in test_browser_save_image.py
Bumping manifests a=b2g-bump