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

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https://hg.mozilla.org/integration/gaia-central/rev/3d9340387359
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #19836 from eeejay/bug-1018340

Bug 1018340 - Make gaia-header edit mode exclusively visible. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9c205e89bf7c
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1018340 - Make gaia-header edit mode exclusively visible.
Bumping manifests a=b2g-bump