Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/1ae9d3ddc4dc
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13235 from davidflanagan/bug923544-v1.2

Merge pull request #13103 from davidflanagan/bug923544

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https://hg.mozilla.org/integration/gaia-1_2/rev/ccbdd3c0ba19
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13103 from davidflanagan/bug923544

Bug 923544: remove unneeded workaround that was causing problems r=aus(cherry picked from commit 8db3fca246d8ba79a8bdd9998f5e12ed11533fea)

Conflicts:

	apps/settings/js/sound.js