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

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https://hg.mozilla.org/integration/gaia-central/rev/b3eccce3ce98
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #14075 from dominickuo/bug-911108-new

Bug 911108 - [music] change the hash and option to mix page when the player is reset by the storages, r=huchengtw-moz

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https://hg.mozilla.org/integration/gaia-central/rev/73b442ede315
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 911108 - [music] change the hash and option to mix page when the player is reset by the storages