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

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https://hg.mozilla.org/integration/gaia-central/rev/ea49a8420049
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #16476 from jmcanterafonseca/fb_link_photos

Bug 974646 - [B2G][Contacts] Linking a Facebook contact to existing cont...

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https://hg.mozilla.org/integration/gaia-central/rev/f1b553e1bddf
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 974646 - [B2G][Contacts] Linking a Facebook contact to existing contact shows local image on contacts list, but Facebook picture in contact details
Bumping manifests a=b2g-bump