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

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https://hg.mozilla.org/integration/gaia-2_0/rev/a5ad99b12d20
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1065877: prevent OOMs when editing, picking and sharing large images

address review comments

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https://hg.mozilla.org/integration/gaia-2_0/rev/4884b3e21a41
Author: ranjith.gutha <ranjith.gutha@lge.com>
Desc: Bug-1039988 Fixing Javascript error while pressing share button in full screen mode
Bumping manifests a=b2g-bump