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

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https://hg.mozilla.org/integration/gaia-central/rev/ec3d226a537c
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #12577 from EverythingMe/bugfix-collection-edit

[Bug 922618] Fix collection edit mode [r=amirn]

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https://hg.mozilla.org/integration/gaia-central/rev/fdd4d553fc06
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 922618] Fix collection edit mode [r=amirn]