Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/d3ee2aca1f8e
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #18571 from arcturus/bug-989923

Bug 989923 - [Contacts][Refactor] New app to host Contacts DataStore in dev apps

========

https://hg.mozilla.org/integration/gaia-central/rev/d27627193cab
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 989923 - [Contacts][Refactor] New app to host Contacts DataStore in test apps

========

https://hg.mozilla.org/integration/gaia-central/rev/d5c92e36e326
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18445 from chuck-lee/bug-997791_Gaia_ui_test_error_on_wifi_enable_disable

Bug 997791 - Simulate echo setting to "wifi.enabled" from system app. r=arthurcc

========

https://hg.mozilla.org/integration/gaia-central/rev/86762c945593
Author: Chuck Lee <chulee@mozilla.com>
Desc: Bug 997791 - Only set wifi.enabled when it is changed. r=arthurcc
Bumping manifests a=b2g-bump