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

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https://hg.mozilla.org/integration/gaia-central/rev/9aae77d344a6
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #20029 from davidflanagan/bug1020002

Bug 1020002: don't allow an activity choice that could subvert forward-lock

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https://hg.mozilla.org/integration/gaia-central/rev/06b8d0d4a71d
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1020002: don't allow an activity choice that could subvert forward-lock

address review comments

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https://hg.mozilla.org/integration/gaia-central/rev/af54dd4f7858
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #18584 from stasm/1000130-gallery-ready

Bug 1000130 - Clean up bootstrap mozL10n API use in Gallery. r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/1109f8599ca9
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1000130 - Clean up bootstrap mozL10n API use in Gallery. r=djf
Bumping manifests a=b2g-bump