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

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https://hg.mozilla.org/integration/gaia-central/rev/09914641c4c3
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #12411 from crh0716/914705

Bug 914705 - Move the disabled style to the shared style file r=alive, ivanovpavel

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https://hg.mozilla.org/integration/gaia-central/rev/6798f835fb83
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 914705 - Move the disabled style to the shared style files

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https://hg.mozilla.org/integration/gaia-central/rev/5a9f0e36940d
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #12498 from rnowm/Bug-920587

Bug 920587 - [BB] Confirm with content BB should properly support the absence of a <small> element

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https://hg.mozilla.org/integration/gaia-central/rev/029a2840fe78
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 920587 - [BB] Confirm with content BB should properly support the absence of a <small> element