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

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https://hg.mozilla.org/integration/gaia-central/rev/90c8313f2d86
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #21230 from punamdahiya/Bug1021782-frame

Bug1021782 - [Gallery] Add a current class to the current frame in fullscreen view r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/f0fd641b9022
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug1021782 - [Gallery] Add a current class to the current frame in fullscreen view r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/f572ae463ed4
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #21327 from alivedise/bugzilla/1002316_master/sound

Bug 1002316 - Homescreen event should be caught by sound manager

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https://hg.mozilla.org/integration/gaia-central/rev/d3645e5c2735
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1002316 - Homescreen event should be caught by sound manager
Bumping manifests a=b2g-bump