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

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https://hg.mozilla.org/integration/gaia-central/rev/25f9411c7656
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #20105 from dchunwong/fixcamera

Bug 1021034 - [flame] Investigate failure in test_camera_flash_modes.py

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https://hg.mozilla.org/integration/gaia-central/rev/61ed086c8f99
Author: Dylan Chun Wong <d.chunwong@gmail.com>
Desc: Bug 1021034 - [flame] Investigate failure in test_camera_flash_modes.py

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https://hg.mozilla.org/integration/gaia-central/rev/50f584cb3165
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #20099 from dchunwong/fixgallery

Bug 1021027 - [Flame] Investigate failure in gallery tests

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https://hg.mozilla.org/integration/gaia-central/rev/bf0a7c48effa
Author: Dylan Chun Wong <d.chunwong@gmail.com>
Desc: Bug 1021027 - [Flame] Investigate failure in gallery tests
Bumping manifests a=b2g-bump