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

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https://hg.mozilla.org/integration/gaia-central/rev/0c30fbda0bf9
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14225 from pivanov/bug-944724

Bug 944724 - [WVGA][Music] Black marks appearing on scrubber in music player

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https://hg.mozilla.org/integration/gaia-central/rev/28124e5834be
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 944724 - [WVGA][Music] Black marks appearing on scrubber in music player