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

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https://hg.mozilla.org/integration/gaia-central/rev/eb9a8803a703
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #19454 from nullaus/bug1007965

bug 1007965

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https://hg.mozilla.org/integration/gaia-central/rev/b37822b9e8e5
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1007965

* DownloadHelper should use new 'storageName' and 'storagePath' properties on DOM Download object instead
  of munging path manually.
* DownloadStore should save 'storageName' and 'storagePath' properties to DataStore for later use.

r=crdlc
Bumping manifests a=b2g-bump