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

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https://hg.mozilla.org/integration/gaia-central/rev/ec760d4fb5da
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #19045 from gasolin/issue-1005797

Bug 1005797 - NFC: There should be an icon for NFC on the status bar, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/16f7a9837786
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1005797 - NFC: There should be an icon for NFC on the status bar
Bumping manifests a=b2g-bump