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

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https://hg.mozilla.org/integration/gaia-central/rev/9ade1131290c
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12384 from yurenju/reduce-size

Bug 917144 - remove some apps to reduce image size

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https://hg.mozilla.org/integration/gaia-central/rev/db6e3683de4a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 917144 - remove some apps to reduce image size

remove apps list below to reduce image size for engineering build:
- cubevid
- testpermission
- image-uploader
- crystalskull
- test-ime
- tests-sensors
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a8a461ecfca7
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12397 from lightsofapollo/revert-bluetooth-share

Revert "Merge pull request #12355 from ian-liu/bluetooth/Bug895480_Bluet...

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https://hg.mozilla.org/integration/gaia-central/rev/49eede8b2a94
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Merge pull request #12355 from ian-liu/bluetooth/Bug895480_Bluetooth_app_tries_to_handle_Share_URL_activity_and_fails"

This reverts commit db54b9d0de74307ad50764cf713662a8de50946a, reversing
changes made to 49a0da45de783c96fb8e49bbc7f1c395d5da9273.
Bug 919845 - Really make Fira Sans the default font, r=jfkthame