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

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https://hg.mozilla.org/integration/gaia-central/rev/46634893ce7d
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #22531 from hfiguiere/bug1007774

Bug 1007774 - Have the performance goal provided by device and output. r=eli

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https://hg.mozilla.org/integration/gaia-central/rev/90b5ede0cc91
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1007774 - Have the performance goal provided by device and output.
Bumping manifests a=b2g-bump