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

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https://hg.mozilla.org/integration/gaia-central/rev/3c2486cedfbf
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #25422 from DouglasSherk/1079810-audio-context

Bug 1079810 - Don't initialize an AudioContext on Callscreen init. r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/6733f44a258e
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1079810 - Don't initialize an AudioContext on Callscreen init. r=gsvelto
Bumping manifests a=b2g-bump