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

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https://hg.mozilla.org/integration/gaia-central/rev/916fa42b75d2
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #12761 from es92/music2-dbloading-improvements

Bug 924988: Improvements to Music2 DB Loading r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/7a6c410fd2a7
Author: Evan Shapiro <evan.a.shapiro@gmail.com>
Desc: Bug 924988: Improvements to Music2 DB Loading