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

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https://hg.mozilla.org/integration/gaia-central/rev/a3510b66ea86
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #10723 from dominickuo/bug-882099-new

Bug 882099 - [music] Check both major and compatible brands for MP4 files, r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/8e47f0c49642
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 882099 - [music] Check both major and compatible brands for MP4 files

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https://hg.mozilla.org/integration/gaia-central/rev/62448468b885
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #10743 from evanxd/bug-881137

Bug 881137 - hdpi/xhdpi resolution assets and layout for Calendar app

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https://hg.mozilla.org/integration/gaia-central/rev/beddaba0f796
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 881137 - Support hdpi resolution device.