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

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https://hg.mozilla.org/integration/gaia-central/rev/c64bab0a2de7
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1106229 - merge pull request #26567 from KevinGrandon:bug_1106229_remove_strings_modal_dialogs to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/108dff300374
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1106229 - Remove strings from index.html for modal dialogs r=kgrandon
Bumping manifests a=b2g-bump