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

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https://hg.mozilla.org/integration/gaia-central/rev/673f65e2f19d
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #19735 from KevinGrandon/bug_1016854_contacts_test

Bug 1016854 - [Contacts] Intermittent MarionetteJS failure on Travis: Contacts > Delete > Edit menu is not visible on search mode

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https://hg.mozilla.org/integration/gaia-central/rev/6cd2cf9c026c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1016854 - [Contacts] Intermittent MarionetteJS failure on Travis: Contacts > Delete > Edit menu is not visible on search mode
Bumping manifests a=b2g-bump