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

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https://hg.mozilla.org/integration/gaia-central/rev/c3dc7284eb8f
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #19186 from kamituel/Bug_1002643

Bug 1002643 - Test cases for NfcHandoverManager. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/b7ee322088ca
Author: Kamil Leszczuk <kamituel@gmail.com>
Desc: Bug 1002643: Test cases for NfcHandoverManager
Bumping manifests a=b2g-bump