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

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https://hg.mozilla.org/integration/gaia-central/rev/ae3c8b28cffd
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #14645 from jmcanterafonseca/fix_flush_final2

Bug 949422 - If a Facebook Friend is removed (from the import list), the...

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https://hg.mozilla.org/integration/gaia-central/rev/8c8a30087bda
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 949422 - If a Facebook Friend is removed (from the import list), then it cannot be imported anymore