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

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https://hg.mozilla.org/integration/gaia-central/rev/25223823210d
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #21012 from crh0716/1028020

Bug 1028020 - Fix the layout of FMD and DNT r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/1c5559d9e25b
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1028020 - Fix the layout of FMD and DNT

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https://hg.mozilla.org/integration/gaia-central/rev/5c04bdf8c848
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #21015 from Anup-Allamsetty/bug1028018

Bug 1028018: [Settings] privacy_sprite.png removed. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/ab28efc6e877
Author: Anup-Allamsetty <allamsetty.anup@gmail.com>
Desc: Bug 1028018: [Settings] privacy_sprite.png removed. r=arthurcc
Bumping manifests a=b2g-bump
Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/30f97c50d3d9
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #20889 from gtorodelvalle/dialer-callscreen-bug-1007709-fluid-font-size

Bug 1007709 - [Dialer][Call Screen] Create fluid size for contact name in the upper information panel

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https://hg.mozilla.org/integration/gaia-central/rev/ac26716bfd16
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 1007709 - [Dialer][Call Screen] Create fluid size for contact name in the upper information panel
Bumping manifests a=b2g-bump