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

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https://hg.mozilla.org/integration/gaia-2_0/rev/ce35c9835ebc
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21766 from svic/Bug_1031993_v2

Bug 1031993 - Show notification when file transfer fails

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https://hg.mozilla.org/integration/gaia-2_0/rev/2893628cd849
Author: Arno Puder <arno@puder.org>
Desc: Bug 1031993 - Show notification when file transfer fails
Bumping manifests a=b2g-bump