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

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https://hg.mozilla.org/integration/gaia-central/rev/505cd1f51227
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #12124 from rexboy7/fix-bug906675-3-refactor-HandledCalls

Bug 912494: conference call detail window

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https://hg.mozilla.org/integration/gaia-central/rev/a59de6f9d24e
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 912494 : conference call detail window