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

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https://hg.mozilla.org/integration/gaia-central/rev/314c4a791f12
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #16303 from etiennesegonzac/assert-no-reflow-keypad

Bug 939186 - Introducing the ReflowHelper for marionette JS tests.
r=gaye, rik

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https://hg.mozilla.org/integration/gaia-central/rev/f902576f5ae2
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 939186 - Introducing the ReflowHelper for marionette JS tests.
And a first test using it for the Dialer Keypad.
r=gaye, rik

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https://hg.mozilla.org/integration/gaia-central/rev/22f49facdbe0
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #16548 from mcjimenez/bug970929

Bug 970929 - Customize network indicator by SIM displayed in Settings:Cellular & Data:Network operator:Network Type

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https://hg.mozilla.org/integration/gaia-central/rev/15f66ad92e4d
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 970929 - Customize network indicator by SIM displayed in Settings:Cellular & Data:Network operator:Network Type
Bumping manifests a=b2g-bump