Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/557dccc348a3
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #21582 from mancas/bug1036805

Bug 1036805 - [Settings] Too many time options for passcode lock require activate time, r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/a2f65e561181
Author: Manuel Casas Barrado <mancas.91@gmail.com>
Desc: Bug 1036805 - [Settings] Too many time options for passcode lock require activate time

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https://hg.mozilla.org/integration/gaia-central/rev/ee99d1b4ae99
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #21530 from mancas/bug1030377

Bug 1030377 - Search clear button is not labeled for accessibility
r=dale

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https://hg.mozilla.org/integration/gaia-central/rev/742ee3a07d67
Author: Manuel Casas Barrado <b.mcb@tid.es>
Desc: Bug 1030377 - Search clear button is not labeled for accessibility

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https://hg.mozilla.org/integration/gaia-central/rev/a31b2a97a1a7
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21535 from crdlc/bug-1036368

Bug 1036368 - Javascript errors when icons are removed while they are be...

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https://hg.mozilla.org/integration/gaia-central/rev/9625ffe97540
Author: crdlc <crdlc@tid.es>
Desc: Bug 1036368 - Javascript errors when icons are removed while they are being decorated
Bumping manifests a=b2g-bump