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

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https://hg.mozilla.org/integration/gaia-central/rev/9351a7b3adfa
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #18165 from stasm/994459-too-much-recursion

Bug 994459 - Fix webapp-optimize bustage (too much recursion). r=asuth r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/8b61d304ea73
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 994459 - Fix webapp-optimize bustage (too much recursion). r=asuth r=ochameau
Bumping manifests a=b2g-bump