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

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https://hg.mozilla.org/integration/gaia-central/rev/c5f56356f98e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21270 from Cwiiis/bug1031094-squashed

Bug 1031094 - Don't remove bookmarks from collections when uninstalling. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/22cf4fb531f1
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1031094 - Don't remove bookmarks from collections when uninstalling. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/2756678c2f6c
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #21246 from nullaus/bug1013509

bug 1013509 - Dismiss Permission Request when requesting app is terminat...

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https://hg.mozilla.org/integration/gaia-central/rev/93af9e968e19
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1013509 - Dismiss Permission Request when requesting app is terminated. r=alive
Bumping manifests a=b2g-bump