Bumping gaia.json for 7 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3f84cc0571ef
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Merge pull request #22606 from allstarschh/Bug1046554

Bug1046554 - B2G NFC: pass NFCPeerEvent in onpeerready. r=johu, dkuo, punam, francisco, daleharvey, alive

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https://hg.mozilla.org/integration/gaia-central/rev/75f2f2ebac71
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1046554 - Part 6: System app change

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https://hg.mozilla.org/integration/gaia-central/rev/9563d4aceaba
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1046554 - Part 5: Contacts app change.

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https://hg.mozilla.org/integration/gaia-central/rev/93bc1d924ddd
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1046554 - Part 4: Browser app change

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https://hg.mozilla.org/integration/gaia-central/rev/2f6e90a41960
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1046554 - Part 3: Music app change

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https://hg.mozilla.org/integration/gaia-central/rev/2a3c24e45ba5
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1046554 - Part 2: Video app change.

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https://hg.mozilla.org/integration/gaia-central/rev/8008f4f3fb20
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Bug 1046554 - Part 1: Gallery change.
Bumping manifests a=b2g-bump