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

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https://hg.mozilla.org/integration/gaia-central/rev/19210e8e3a3e
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18244 from justindarc/bug994426

Bug 994426 - [camera][madai] Options menu items in wrong order

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https://hg.mozilla.org/integration/gaia-central/rev/be94ec802499
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 994426 - [camera][madai] Options menu items in wrong order

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https://hg.mozilla.org/integration/gaia-central/rev/b3a02d6eefd5
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #18089 from punamdahiya/Bug992426

Bug992426-[Gallery]-Fix of showing images saved from messaging app in gallery r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/7e2f75d4b70d
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug992426-[Gallery]-Fix of showing images saved from messaging app in gallery r=djf
Bumping manifests a=b2g-bump