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

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https://hg.mozilla.org/integration/gaia-central/rev/7e913d93cc2b
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #21104 from dominickuo/bug-1015042

Bug 1015042 - [Music] Use the backup duration when the audio.duration is Infinity, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/0a3c0dd88374
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1015042 - [Music] Make sure the audio duration is not NaN or Infinity
Bumping manifests a=b2g-bump