Bumping gaia.json for 5 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/de7396523254
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12550 from zacc/bug922062

Bug 922062. gaia-ui-tests: Skip cleanUp steps that are not necessary whe...

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https://hg.mozilla.org/integration/gaia-central/rev/8775e70114fd
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 922062. gaia-ui-tests: Skip cleanUp steps that are not necessary when --restart is passed in. r=bebe/davehunt

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https://hg.mozilla.org/integration/gaia-central/rev/82214cc7c87e
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 921827 - Follow-up fix to use properties for the media type lists. r=bebe

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https://hg.mozilla.org/integration/gaia-central/rev/47c82c1e38a5
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #12548 from jmcanterafonseca/contacts_types_bug

Bug 922037 - Contacts email, phone or address type cannot be selected

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https://hg.mozilla.org/integration/gaia-central/rev/e3f3c67d40b0
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 922037 - Contacts email, phone or address type cannot be selected