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

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https://hg.mozilla.org/integration/gaia-central/rev/4e435fd97c9c
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #12639 from jmcanterafonseca/fix_gmail_import_name

Bug 898304 - [Contact] Import from gmail shows null when the contact doe...

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https://hg.mozilla.org/integration/gaia-central/rev/5fc1a5c64982
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 898304 - [Contact] Import from gmail shows null when the contact does not have name