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

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https://hg.mozilla.org/integration/gaia-central/rev/35b93b697fb5
Author: Askeing Yen (fyen) <askeing@gmail.com>
Desc: Merge pull request #14686 from echangmoz/master

Bug 950539 - Fix gallery tests

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https://hg.mozilla.org/integration/gaia-central/rev/b506389d0119
Author: Eric Chang <echang@mozilla.com>
Desc: Bug 950539 - Fix gallery tests