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

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https://hg.mozilla.org/integration/gaia-central/rev/8d483aad9a25
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 941969 - Optimize JS for system app"

This reverts commit 66e26679d4ecd7b1d0a013555e3b33871354046d.

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https://hg.mozilla.org/integration/gaia-central/rev/2c9c66c6aa05
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #25385 from jonallengriffin/gulogging

Bug 1086673 - Log console/warn/info/dir/error messages sent over the soc...

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https://hg.mozilla.org/integration/gaia-central/rev/3049ddb32f4a
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 1086673 - Log console/warn/info/dir/error messages sent over the socket for Gu tests, r=julienw
Bumping manifests a=b2g-bump