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

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https://hg.mozilla.org/integration/gaia-central/rev/7319f9447565
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #17007 from vingtetun/bug981440

Bug 981440 - Add a CSS linter to the build system. r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/0d2cd9e2d98c
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 981440 - Add a CSS linter to the build system. r=ochameau
Bumping manifests a=b2g-bump