Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/260ceda6d54c
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11493 from pivanov/bug-903491

Bug 903491 - [HD][Browser] Refresh icon appears to be in SD r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/4ce7490a7042
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 903491 - [HD][Browser] Refresh icon appears to be in SD

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https://hg.mozilla.org/integration/gaia-central/rev/9bcc87a8a908
Author: Amir Nissim <amirn@everything.me>
Desc: Bug 898639 - [EVERYTHING.ME] User is unable to add bookmarks to Homescreen r=vingtetun

Added missing 'var' declarations, one of which was setting window.name from 'main' to other values
Bug 899885 - 1/2: B2G RIL - Callback-based worker messaging. Add WorkerMessenger. r=yoshi
Bug 899885 - 2/2: fix all communications to ril_worker. r=yoshi,gene