Bumping gaia.json for 6 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/12379f829ad1
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #11247 from jmcanterafonseca/fb_link_broken

Bug 899503 - FB Link is broken after landing bug 895824

========

https://hg.mozilla.org/integration/gaia-central/rev/589c5e9d560c
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 899503 - FB Link is broken after landing bug 895824

========

https://hg.mozilla.org/integration/gaia-central/rev/fe2329f31cf3
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #11260 from cctuan/899422

Bug 899422 - [System][HD] lack of image assets

========

https://hg.mozilla.org/integration/gaia-central/rev/4acc89b1bb75
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 899422 - [System][HD] lack of image assets

========

https://hg.mozilla.org/integration/gaia-central/rev/8420b76828bb
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #11248 from jmcanterafonseca/fix_fb_passive_mode

Bug 899525 - In passive mode merge do not match existing FB Contacts

========

https://hg.mozilla.org/integration/gaia-central/rev/02a817b06f5e
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 899525 - In passive mode merge do not match existing FB Contacts
Bug 897869 - [b2g-ril] Need to keep CLIR settings across reboots. r=vicamo