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

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https://hg.mozilla.org/integration/gaia-central/rev/c659a8149e13
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1106666 - merge pull request #26628 from KevinGrandon:bug_1106666_window_transition_fix to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/fd296d9c733d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1106666 - Fix browser window transition
Bumping manifests a=b2g-bump