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

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https://hg.mozilla.org/integration/gaia-central/rev/19a8fdd2773a
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #21782 from dmarcos/bug1024384

bug 1024384 - Listen to default storage location change, update our devi...

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https://hg.mozilla.org/integration/gaia-central/rev/0c66a1e4603b
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1024384 - Listen to default storage location change, update our device storage instances when needed. r=wilsonpage
Bumping manifests a=b2g-bump