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

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https://hg.mozilla.org/integration/gaia-central/rev/e0ddf2f489b3
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #15540 from SasikalaParuchuri/Bug_935991_Added_Test_For_Delete_Option

Bug 935991 - [Messages] Added new test for Delete menu option r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/e50a403808b1
Author: sasikala.paruchuri <sasikala.paruchuri@lge.com>
Desc: Bug 935991 - [Messages] Added new test for Delete menu option
Bumping manifests a=b2g-bump