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

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https://hg.mozilla.org/integration/gaia-central/rev/ac2113ec1d72
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #23748 from TheoChevalier/selected-message-thread

Bug 1063256 - Need new strings for "{{n}} selected", due to new UX

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https://hg.mozilla.org/integration/gaia-central/rev/30af5a503163
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1063256 - Need new strings for "{{n}} selected", due to new UX

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https://hg.mozilla.org/integration/gaia-central/rev/93d2b39a16e1
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #23847 from tauzen/Bug1062699_browser_1st_tab_share

Bug 1062699 - NfcHandler fix to share url of active tab via NFC. +small renaming to match NFC terminology, r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/bd74dca09c5a
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1062699 - NfcHandler fix to share url of active tab via NFC. +small renaming to match NFC terminology, r=gweng
Bumping manifests a=b2g-bump