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

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https://hg.mozilla.org/integration/gaia-central/rev/25757815ece8
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #13444 from lissyx/bug933997

Bug 933997 - Fix online support href retrieval r=aus

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https://hg.mozilla.org/integration/gaia-central/rev/e08187d4d92e
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 933997 - Fix online support href retrieval