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

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https://hg.mozilla.org/integration/gaia-central/rev/7f5ad73ea793
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #20790 from nullaus/bug1025853

bug 1025853 - Add save link context menu option for anchor tags. r=benfr...

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https://hg.mozilla.org/integration/gaia-central/rev/1117b468deb1
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1025853 - Add save link context menu option for anchor tags, with awesomer UX. r=benfrancis
Bumping manifests a=b2g-bump