Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/e32848e9f065
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #11788 from comoyo/bug_811177

Bug 811177 - Add designmode=on tests to IME tests. r=yxl

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https://hg.mozilla.org/integration/gaia-central/rev/e28b273eac9b
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 811177 - Add designmode=on tests to IME tests