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

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https://hg.mozilla.org/integration/gaia-central/rev/e4504e99aaff
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #26214 from cctuan/1100195

Bug 1100195 - [NFC] We should prevent shrinking while switching apps by edge gesture

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https://hg.mozilla.org/integration/gaia-central/rev/39cf54f42494
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1100195 - [NFC] We should prevent shrinking while switching apps by edge gesture
Bumping manifests a=b2g-bump