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

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https://hg.mozilla.org/integration/gaia-central/rev/a9ca4fe1b8b5
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #18077 from comoyo/bug993390

Bug 993390 - Don't do a sync reflow if we just cleared the element. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/88886b5f06e8
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 993390 - Don't do a sync reflow if we just cleared the element
Bumping manifests a=b2g-bump