Bumping gaia.json for 6 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6ada02214401
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14158 from askeing/944235

Bug 944235 - Modify the CostControl app of gaiatest

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https://hg.mozilla.org/integration/gaia-central/rev/74cc021ec76f
Author: askeing <askeing@gmail.com>
Desc: Bug 944235 - Modify the CostControl app of gaiatest

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https://hg.mozilla.org/integration/gaia-central/rev/1f4f397bb195
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14188 from askeing/944458

Bug 944458 - Xfail test_cost_control_reset_wifi.py

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https://hg.mozilla.org/integration/gaia-central/rev/69914d1d622f
Author: Askeing <askeing@gmail.com>
Desc: Bug 944458 - Xfail test_cost_control_reset_wifi.py

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https://hg.mozilla.org/integration/gaia-central/rev/c941704be0e7
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #14185 from EverythingMe/944026-installed-size

[Bug 944026] Make sure installed apps are the native size [r=amirn]

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https://hg.mozilla.org/integration/gaia-central/rev/8a1924b37185
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 944026] Make sure installed apps are the native size [r=amirn]