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

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https://hg.mozilla.org/integration/gaia-central/rev/8760b47f6b4c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14180 from pivanov/bug-944345

Bug 944345 - [Shared] Followup: Update shared action icons

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https://hg.mozilla.org/integration/gaia-central/rev/ca0477b7cae3
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 944345 - [Shared] Followup: Update shared action icons