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

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https://hg.mozilla.org/integration/gaia-central/rev/911ffcfec209
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13221 from AndreiH/bug932492

Bug 932492 - Put [DEFAULT] blocks into each functional test folder's man...

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https://hg.mozilla.org/integration/gaia-central/rev/b9ed35fea104
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 932492 - Put [DEFAULT] blocks into each functional test folder's manifest file