Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/49e443173e45
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #12809 from gasolin/issue-902036

Bug 902036 - [B2G][Settings][Media Storage]Spelling error on Default Med...,r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/a10f3481e3bb
Author: gasolin <gasolin@gmail.com>
Desc: Bug 902036 - [B2G][Settings][Media Storage]Spelling error on Default Media Location Information Screen