Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/39938f581efd
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #12012 from huchengtw-moz/video/Bug_910094_ui_polish

Bug 910094 - [Video] - UI Fixes in Gallery View and Video Player, r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/eece41240fe6
Author: John Hu <johu@mozilla.com>
Desc: Bug 910094 - [Video] - UI Fixes in Gallery View and Video Player
Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/65525ba1e831
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #12023 from huchengtw-moz/shared/Bug_912842_photo_doesnt_return_original_size

Bug 912842 - [Buri][Camera][REG]Photo does not return to its original si..., r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/1bcf48d844df
Author: John Hu <johu@mozilla.com>
Desc: Bug 912842 - [Buri][Camera][REG]Photo does not return to its original size

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https://hg.mozilla.org/integration/gaia-central/rev/7a6fd2579998
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #12151 from samjoch/bug-816358-NotificationsScreenshotSavedToGalleryIcon

Bug 816358 - [Notification] "Screenshot saved to Gallery" notification does not have Gallery icon r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/30da7f157d70
Author: Sam Joch <samuel@guiora.com>
Desc: Bug 816358 - [Notification] "Screenshot saved to Gallery" notification does not have Gallery icon