Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/0452882ba864
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11541 from snowmantw/issue904982

Bug 904982 - [System] System reboot if CustomDialog shows with improper callbacks, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/349a68bfec90
Author: Greg Weng (snowmantw) <gweng@mozilla.com>
Desc: Bug 904982 - [System] System reboot if CustomDialog shows with improper callbacks

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https://hg.mozilla.org/integration/gaia-central/rev/9c65f0e58196
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #11424 from gabrielesvelto/bug-902500-scrollintoview

Bug 902500 - Prevent synchronous reflows when scrolling to the bottom of the message list r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/537dea3ef4f7
Author: Gabriele Svelto <gabriele.svelto@gmail.com>
Desc: Bug 902500 - Prevent synchronous reflows when scrolling to the bottom of the message list