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

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https://hg.mozilla.org/integration/gaia-central/rev/35a90af6d901
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #16619 from gtorodelvalle/contacts-bug-972600-add-contact-after-merging

Bug 972600 - [B2G][Contacts] After merging duplicate contacts selecting edit contact button brings up 'Add contact' screen

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https://hg.mozilla.org/integration/gaia-central/rev/c8589153a7e6
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 972600 - [B2G][Contacts] After merging duplicate contacts selecting edit contact button brings up 'Add contact' screen
Bumping manifests a=b2g-bump