Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4e9305333b0f
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #26672 from Cwiiis/bug1109068-group-bg-animation

Bug 1109068 - Fix group background animation in non-edit mode. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/cdb847753371
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1109068 - Fix group background animation in non-edit mode. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/8a5bee4605a8
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1109089 - merge pull request #26674 from etiennesegonzac:bug-1109089 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/22924126e1ab
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1109089 - Make sure `cardviewclosed` is broadcasted properly to app windows.
So that the screenshots are properly unloaded.

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https://hg.mozilla.org/integration/gaia-central/rev/edb2cdf76cfd
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26605 from mwargers/fullscreen2

Bug 982839 - Write a test to protect against the regression seen in bug ...

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https://hg.mozilla.org/integration/gaia-central/rev/313904be386c
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 982839 - Write a test to protect against the regression seen in bug 981804 (navigate out of fullscreen video)
Bumping manifests a=b2g-bump