Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/69698f437888
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12492 from crdlc/bug-920942

Bug 920942 - window.confirm isn't shown

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https://hg.mozilla.org/integration/gaia-central/rev/49c1870d6c0b
Author: crdlc <crdlc@tid.es>
Desc: Bug 920942 - window.confirm is not shown

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https://hg.mozilla.org/integration/gaia-central/rev/2b4b44bb564f
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12439 from crdlc/bug-915085

Bug 915085 - Apps included in the grid should be linked to a Smart Collection

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https://hg.mozilla.org/integration/gaia-central/rev/c2642af52e18
Author: crdlc <crdlc@tid.es>
Desc: Bug 915085 - Apps included in the grid should be linked to a Smart Collection