Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6d1dccb9430c
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #17021 from sergi/921971-fdn-fix1

Bug 921971 - [DSDS][FDN] Manage FDN list for both SIMs

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https://hg.mozilla.org/integration/gaia-central/rev/37cc941601cf
Author: Sergi Mansilla <sergi@Sergis-MacBook-Pro.local>
Desc: Bug 921971 - [DSDS][FDN] Manage FDN list for both SIMs

This fix makes it possible to have independent Fixed Dialing Numbers for each
SIM card in the phone. A new function `getIccByIndex` has been introduced in
`utils.js` that selects the currently selected ICC object without the user
having to specify the particular index, although it allows that too (used in
`sim_dialog.js`, for example.

Instances of `IccHelper` have been replaced by the result of calls to
`getIccByIndex`.

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https://hg.mozilla.org/integration/gaia-central/rev/57d743cf678a
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17020 from jmcanterafonseca/vivien_search

Bug 981327 - [JavaScript Error: 'TypeError: item is undefined' {file: ap...

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https://hg.mozilla.org/integration/gaia-central/rev/9977d5760e14
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 981327 - [JavaScript Error: 'TypeError: item is undefined' {file: app://communications.gaiamobile.org/shared/js/binary_search.js line: 26}]
Bumping manifests a=b2g-bump