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

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https://hg.mozilla.org/integration/gaia-central/rev/1fed63dea282
Author: Jim Porter <jporter@mozilla.com>
Desc: Merge pull request #19964 from jimporter/ringtones-share-audio-channel

Bug 1019967 - [ringtones] Fix pausing the music app during the share rington...

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https://hg.mozilla.org/integration/gaia-central/rev/082f54572a2b
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 1019967 - [ringtones] Fix pausing the music app during the share ringtone activity; r=djf
Bumping manifests a=b2g-bump