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

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https://hg.mozilla.org/integration/gaia-central/rev/10e210ac2805
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #11705 from davidflanagan/bug903944-2

Bug 903944 - workaround gecko crash in bug 908432 r=therold

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https://hg.mozilla.org/integration/gaia-central/rev/fd39a8faa208
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 903944 - workaround gecko crash in bug 908432

fix two places where we were not checking preview size correctly