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

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https://hg.mozilla.org/integration/gaia-central/rev/e2c760014774
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #18750 from jmcanterafonseca/oauth_facebook

Bug 1003725 - [FTU-separation] Move import.html and related resources to shared/pages/import

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https://hg.mozilla.org/integration/gaia-central/rev/129180e4d55d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1003725 - [FTU-separation] Move import.html and related resources to shared/pages/import
Bumping manifests a=b2g-bump