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

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https://hg.mozilla.org/integration/gaia-central/rev/b26483c91cf6
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18343 from mcav/text-select

Bug 976197 - [B2G][Clock] Stopwatch button texts can be highlighted. r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/9f5238f09d8f
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 976197 - [B2G][Clock] Stopwatch button texts can be highlighted when user double taps an inactive button.

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https://hg.mozilla.org/integration/gaia-central/rev/a8364d509595
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18390 from mcav/icon-repeated

Bug 992876 - Reply icon repeated. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/822dd90edb83
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 992876 - Reply icon repeated.
Bumping manifests a=b2g-bump