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

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https://hg.mozilla.org/integration/gaia-central/rev/c2a13d1a2278
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #11210 from huchengtw-moz/video/Bug_898324_there_is_1px_shifting

Bug 898324 - There is 1px shifting down of selection border, r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/ebdadf56095e
Author: John Hu <johu@mozilla.com>
Desc: Bug 898324 - There is 1px shifting down of selection border

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https://hg.mozilla.org/integration/gaia-central/rev/473773a65d55
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #11207 from huchengtw-moz/video/Bug_898377_missing_1.5x_icon

Bug 898377 - The 1.5x icon is missing in Video app on Gaia master branch, r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/e32d1a3520c0
Author: John Hu <johu@mozilla.com>
Desc: Bug 898377 - The 1.5x icon is missing in Video app on Gaia master branch