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

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https://hg.mozilla.org/integration/gaia-central/rev/477c040809a7
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #25851 from etiennesegonzac/bug-1091067

Bug 1091067 - Making sure the edge zones aren't covering the app chrome in landscape r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/61247b99cac2
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1091067 - Making sure the edge zones aren't covering the app chrome in landscape.

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https://hg.mozilla.org/integration/gaia-central/rev/3db6756a34be
Author: RickyChien <RickyChien@users.noreply.github.com>
Desc: Merge pull request #25932 from mozilla-b2g/revert-25512-bug-969215

Revert "Bug 969215 - Execute |make| should only build specific apps we modified r=me

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https://hg.mozilla.org/integration/gaia-central/rev/0701dcdfd363
Author: RickyChien <RickyChien@users.noreply.github.com>
Desc: Revert "Bug 969215 - Execute |make| should only build specific apps we modified"
Bumping manifests a=b2g-bump