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

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https://hg.mozilla.org/integration/gaia-central/rev/45641c4471d9
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #11625 from dominickuo/bug-907052

Bug 907052 - Fix the lack of bug 900159, r=huchengtw-moz

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https://hg.mozilla.org/integration/gaia-central/rev/604d1a438a33
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 907052 - Fix the lack of bug 900159