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

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https://hg.mozilla.org/integration/gaia-central/rev/063f8655fd5a
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #16690 from jimporter/music-id3-tests

Bug 947816 - [music] Test parsing of id3v2.* metadata

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https://hg.mozilla.org/integration/gaia-central/rev/27b0f6b30019
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 947816 - [music] Test parsing of id3v2.* metadata
Bumping manifests a=b2g-bump