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

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https://hg.mozilla.org/integration/gaia-central/rev/a4bb4b7a207f
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #13225 from jmcanterafonseca/fix_932765

Bug 932765 - Dialer / Call log does not recognize incoming / outgoing ca...

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https://hg.mozilla.org/integration/gaia-central/rev/8d1d7708e789
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 932765 - Dialer / Call log does not recognize incoming / outgoing calls from FB contacts