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

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

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https://hg.mozilla.org/integration/gaia-central/rev/dfc676c55183
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #21511 from KDDI-tech/Bug974864_PR2

Bug 974864: [MMS]Pick recipient(email adress) up from contacts app r=julien,francisco

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https://hg.mozilla.org/integration/gaia-central/rev/ddf1f4c68037
Author: Kotaro Oki <ko-oki@kddi-tech.com>
Desc: Bug 974864: [MMS]Pick recipient(email adress) up from contacts app r=julien,francisco

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https://hg.mozilla.org/integration/gaia-central/rev/20d8f6d1a298
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #21505 from eeejay/bug-977276

Bug 977276 - Hide dialog-overlay when screen is locked. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/9df24aba9d6b
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 977276 - Hide dialog-overlay when screen is locked.

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https://hg.mozilla.org/integration/gaia-central/rev/c8a00fa60a0b
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #21882 from gaye/bug-1036753

Bug 1036753 - Can't delete calendar account r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/770f05c51fac
Author: gaye <gaye@mozilla.com>
Desc: Bug 1036753 - Add end-to-end test for calendar account deletion

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https://hg.mozilla.org/integration/gaia-central/rev/af81552d2c26
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1036753 - [Calendar] can't delete account