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

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https://hg.mozilla.org/integration/gaia-central/rev/2a4b24695c89
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26138 from kanru/bug-1098338

Bug 1098338 - Fix one more BrowserAPI usage. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/753a9f8c8a22
Author: Kan-Ru Chen (陳侃如) <kanru@kanru.info>
Desc: Bug 1098338 - Fix one more BrowserAPI usage. r=alive
Bumping manifests a=b2g-bump