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

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https://hg.mozilla.org/integration/gaia-central/rev/e1c6b9991fba
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14327 from pivanov/bug-945773

Bug 945773 - [Settings] 1.3 Visual Refresh - Add NFC Icon

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https://hg.mozilla.org/integration/gaia-central/rev/305e148f9457
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 945773 - [Settings] 1.3 Visual Refresh - Add NFC Icon

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https://hg.mozilla.org/integration/gaia-central/rev/0e16cf347609
Author: Sam Joch <samuel@guiora.com>
Desc: Revert "Merge pull request #14033 from KevinGrandon/reland_bug_936201"

This reverts commit 8245888f1ac0d27cebbcb48dfdb7e75d89586b00, reversing
changes made to 2dd4c604c1a17e82f2a7e90d7838dab1516c6dde.

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https://hg.mozilla.org/integration/gaia-central/rev/4fed4d7567fa
Author: Sam Joch <samuel@guiora.com>
Desc: Revert "Merge pull request #14156 from gasolin/issue-942704"

This reverts commit ee1bfd4a260e732264f8486cbf62197760de984a, reversing
changes made to c061ad61abd64f050c48805b27baf047e90bf084.