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

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https://hg.mozilla.org/integration/gaia-central/rev/1eae6e9ed4ff
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #13858 from dominickuo/bug-932388

Bug 932388 - [1.3] Music App launch time improvements, r=@dominickuo

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https://hg.mozilla.org/integration/gaia-central/rev/b75458b8718c
Author: Dave Huseby <dhuseby@mozilla.com>
Desc: Bug 932388 - [1.3] Music App launch time improvements