Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6b43ac014f87
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #26837 from alivedise/bugzilla/1106855/do-not-block-system-resize-on-rocketbar

Bug 1106855 - Resize on orientationchange on active window +autoland, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/5d78038e9143
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1106855 - Resize on orientationchange on active window
Bumping manifests a=b2g-bump