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

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https://hg.mozilla.org/integration/gaia-central/rev/654ac59305ed
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #25976 from BorisChiou/layerscope

Bug 1040651 - Map a preference to a Gaia setting to enable Layerscope r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/10d644edd7ed
Author: Boris Chiou <boris.chiou@gmail.com>
Desc: Bug 1040651 - Map a preference to a Gaia setting to enable Layerscope

Add a new option, "LayerScope", in "Settings -> Developer", so we can
enable this perference dynamically, instead of enabling it manually by
edit-prefs.sh.

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https://hg.mozilla.org/integration/gaia-central/rev/79def8e50b5c
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #25867 from gasolin/issue-10938071

Bug 1093807 - [Settings][Application Storage]show 2 digits storage size, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/4a8538b2b7c2
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1093807 - [Settings][Application Storage]show 2 digits storage size
Bumping manifests a=b2g-bump