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

========

https://hg.mozilla.org/integration/gaia-central/rev/0c3afab70cbe
Author: Jim Porter <squibblyflabbetydoo@gmail.com>
Desc: Merge pull request #14793 from jimporter/music-scale-progress

Bug 950783 - [music] Make progress bar scale to the whole width of the screen, no matter the resolution; r=dkuo

========

https://hg.mozilla.org/integration/gaia-central/rev/bc4f8368e95c
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 950783 - [music] Make progress bar scale to the whole width of the screen, no matter the resolution