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

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https://hg.mozilla.org/integration/gaia-central/rev/c92c2e5f21f3
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18482 from crdlc/bug-997461

Bug 997461 - Cannot open bookmarks installed with v1.3 in v1.4

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https://hg.mozilla.org/integration/gaia-central/rev/7dcc24a0e260
Author: crdlc <crdlc@tid.es>
Desc: Bug 997461 - Cannot open bookmarks installed with v1.3 in v1.4
Bumping manifests a=b2g-bump