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

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https://hg.mozilla.org/integration/gaia-1_4/rev/26346060b207
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21119 from nullaus/v1.4

Merge pull request #21069 from nullaus/bug1022804

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https://hg.mozilla.org/integration/gaia-1_4/rev/7fe6c3db79a3
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21069 from nullaus/bug1022804

bug 1022804 - Clear all references of a successful download from the Dow...
(cherry picked from commit ddfea87310513b5499200175c752ad14cf044bf7)
Bumping manifests a=b2g-bump