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

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https://hg.mozilla.org/integration/gaia-2_0/rev/192aaea54966
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #22435 from davidflanagan/bug1039943-v2.0

Merge pull request #22374 from davidflanagan/bug1039943

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https://hg.mozilla.org/integration/gaia-2_0/rev/ff967cca964b
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #22374 from davidflanagan/bug1039943

Bug 1039943: make gallery exit if it goes to background while scanning o... r=pdahiya(cherry picked from commit 63a273c6d1bfb2b939718c7262a9e45d92ce9a89)

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https://hg.mozilla.org/integration/gaia-2_0/rev/84d055f13545
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22282 from mikehenrty/bug-1038988-reland-wallpaper

Bug 1038988 - Use fast path to GPU for wallpaper (reland)
Conflicts:
	apps/system/style/statusbar/statusbar.css
	apps/system/style/system/system.css
Bumping manifests a=b2g-bump