Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/37bae3d7a601
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 989974 - Disable intermittent failing unit test, system/HardwareButtons press and hold home (screen enabled) r=me

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https://hg.mozilla.org/integration/gaia-central/rev/d1ee868ca99b
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #17814 from dmarcos/bug986882

Bug 986882 - [Camera][Madai] Color inconsistency in buttons on active st...

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https://hg.mozilla.org/integration/gaia-central/rev/1d387fd12796
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 986882 - [Camera][Madai] Color inconsistency in buttons on active state
Bumping manifests a=b2g-bump