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

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https://hg.mozilla.org/integration/gaia-central/rev/3b783fe7dcda
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #21388 from gasolin/issue-951538

Bug 951538 - [Settings] Move Reset option up one level, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/ee47b206cb85
Author: gasolin <gasolin@gmail.com>
Desc: Bug 951538 - [Settings] Move Reset option up one level

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https://hg.mozilla.org/integration/gaia-central/rev/ab349c2ebbe3
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #21407 from weigao123/Bug1023111_master

Bug 1023111 - scrollIntoView() to show pin input box, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/ea28818b0edc
Author: wei.gao <wei.gao@spreadtrum.com>
Desc: Bug 1023111 - (master) scroll pin input page to show pin input box. r=Tim.
Bumping manifests a=b2g-bump